Disclosure of accounting policy for the basis and manner that goods are added and removed from inventory in the course of production (work in process) and the accounting policy for revenue recognition. Inventory Valuation, Cost Estimation and Revenue Recognition Disclosure of accounting policy for recognizing investment tax credits. Investment Tax Credits Schedule of contracts in process. Schedule of contracts in process Value of contracts before progress payments and reserves of inventories associated with long-term contracts or programs. Gross contract value The hourly increase in pension contributions, per year, based upon the negotiated union contract. Increase in contribution, hourly rate Amount of contributions which the employer contributes in a matching contribution to a defined contribution plan. Employer matching contributions to 401(k) plan The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to differences in ESOP fair value. ESOP cost versus Fair Market Value Name of the equity-based compensation arrangement plan. 2007 Plan [Member] Name of the equity-based compensation arrangement plan. 2000 Plan [Member] Information by name of employee stock ownership plan. Employee Stock Ownership Plan [Member] Amendment Description Information pertaining to unearned employee stock ownership plan shares. Unearned ESOP Shares [Member] Amendment Flag Reflects the percentage that a specified dollar value on the balance sheet or income statement in the period from one or more specified geographic areas is to a corresponding consolidated, segment, or product line amount. Risk is the materially adverse effects of economic decline or antagonistic political actions resulting in loss of assets, sales volume, labor supply, or source of materials and supplies in a US state or a specified country, continent, or region such as EMEA (Europe, Middle East, Africa). Foreign U.K. Customers [Member] Document And Entity Information The closing price per share of security quoted in same currency as Trading currency. Entity Common stock, closing sale price Total of all stockholders' equity (deficit) items, before ESOP and Treasury stock. TotalStockholdersEquityBeforyEsopAndTreasuryStock Total stockholders equity before ESOP and treasury stock Significant Customers [Abstract] The disclosure for revenues in the period from one or more significant customers. SignificantCustomersTextBlock Significant Customers Stock Rights Plan [Abstract] Stock Rights Plan Details Narrative The entire disclosure for stock right plans. StockRightsPlanDisclosureTextBlock Stock Rights Plan Employee Stock Ownership Plan [Abstract] Employee Stock Ownership Plan Tables The entire disclosure for employee stock ownership plan. EmployeeStockOwnershipPlanTextBlock Employee Stock Ownership Plan The schedule of common shares reserved for future issuance as stock option awards. Schedule of reserved common shares for future issuance Increase (reduction) in rate resulting from: The number of customers specifically identified in disclosure of concentration risk. Number of customers Expiration date of the stock rights plan in CCYY-MM-DD format. Expiration date of the plan The number of common stock purchase rights distributed as a dividend per share of common stock outstanding as of the date of record. Number of rights distributed as a dividend, per share of common stock The threshold percentage of ownership of the Company's stock that triggers the exercise of stock rights. Beneficial ownership percentage that causes rights to be exercisable Current Fiscal Year End Date The percentage of the Company's assets, or earning power, that are sold to another person that triggers the exercise of stock rights. Percentage sale of assets or earning power to another person where rights become exercisable Minimum number of hours worked per year for nonunion employees to participate in ESOP. Number of hours worked per year to quality for the plan Amount of deferred tax benefit attributable to unrecognized share-based compensation. Deferred tax benefit related to unrecognized compensation costs Aggregate dividends paid during the period for each share of common stock outstanding. Special dividend paid per share Number of Shares Subject to Option Weight Average Exercise Price Weighted Average Remaining Contractual Term The contractual life of stock options under the Company's plans. ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodContractualTerm Granted Aggregate Intrinsic Value Weighted Average Number of Shares Subject to Option Average Grant Date Fair Value Document Period End Date Shares reserved for future issuance Numerator: Denominator: Accrued dividends as of balance-sheet date for each share of common stock outstanding. Common Stock Accrued Dividends Per Share Accrued dividend per share Represents the amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax effect of dividends on unallocated ESOP shares. Adjustment to Additional Paid in Capital Income Tax Effect of Dividends on Unallocated Employee Stock Ownership Plan Tax effect of dividends on unallocated ESOP shares Award Type [Axis] Represents the amount of tax effect of dividends on unallocated ESOP shares during the reporting period. Tax Effect of Dividends on Unallocated Employee Stock Ownership Plan Operating Activities Tax effect of dividends on unallocated ESOP shares Represents the amount of dividends accrued in noncash investing or financing activities. Accrual of Dividends Accrual of dividends Tabular disclosure of estimated useful lives of depreciable assets. Schedule of Estimated Useful Lives Of Depreciable Assets Table [Text Block] Schedule of Estimated useful lives of depreciable assets Is Entity a Well-known Seasoned Issuer Is Entity a Voluntary Filer Is Entitys Reporting Status Current Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Summary of Significant Accounting Policies [Abstract] Accounts receivable [Member] Accounts payable Accounts payable Trade accounts receivable, net Trade accounts receivable, net Accrued expenses: Accrued expenses: Salaries and wages Salaries, wages and commissions Payroll and other taxes withheld and accrued Payroll and other taxes withheld and accrued Income taxes payable Income taxes payable ESOP payable ESOP payable Vacation Vacation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated depreciation Accumulated Other Comprehensive Income (Loss) [Member] Accumulated other comprehensive (loss) income Accumulated other comprehensive (loss) income Capital in excess of par value Capital in excess of par value Capital in Excess of Par Value [Member] Tax effect of stock options exercised Stock option expense Adjustments to reconcile net income to net cash provided by operating activities: Stock based compensation expense Allowance for doubtful accounts Anti-dilutive options excluded from calculation of EPS Asset Impairment Charges [Abstract] Impairment of Long-Lived Assets ASSETS Assets Total assets Assets, Current Total current assets Fair Value Total Schedule of cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale securities One to Five Years Gross Unrealized Losses Years to maturity of Available-for-sale securities Amortized Cost Less than One Year Gross Unrealized Gain Buildings and improvements [Member] Contracts in Process [Abstract] Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cash and cash equivalents Cash and cash equivalents, end of the year Cash and cash equivalents, beginning of the year Cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Decrease in cash and cash equivalents Certificates of deposit [Member] Exercise price (per share) Number of shares that can be purchased by exercising each stock right Date purchased rights distributed Commitments and Contingencies Commitments and Contingencies [Abstract] Common stock, par value $.33-1/3 per share Authorized 10,000,000 shares; Issued 3,029,874 shares as of June 30, 2015 and 2014. Outstanding 2,362,687 and 2,368,110 as of June 30, 2015 and 2014, respectively (includes 79,167 and 97,500 Unearned ESOP Shares, respectively) Common stock, par value $.33-1/3 per share. Authorized 10,000,000 shares; Issued 3,029,874 shares in 2014 and 2013. Outstanding 2,368,110 and 2,344,690 in 2014 and 2013, respectively (includes 97,500 and 116,666 Unearned ESOP Shares) Common stock, shares issued Dividends paid per share Cash dividends on common stock (in dollars per share) Common stock, shares authorized Common stock, par value Common Stock [Member] Common stock, shares outstanding Common shares outstanding, beginning of period Number of common shares reserved Common Stock, Shares Held in Employee Trust, Shares Unearned ESOP, shares Pension Expense [Abstract] Components of the provision for income taxes Tax effects of temporary differences Comprehensive Income Total comprehensive income Total comprehensive income Concentration Risk Type [Domain] Concentration Risk Type [Axis] Concentrations of Risk Concentration Risk Benchmark [Domain] Concentration of Credit Risk Concentration Risk percentage Concentration Risk Benchmark [Axis] Contingent liability on outstanding letters of credit Cost of sales Costs relating to contracts that may not be completed within the next year Current tax expense - federal Current tax (benefit) expense - state Variable rate basis Line of Credit [Abstract] Spread on variable interest rate Line of Credit Deferred tax liabilities: Deferred tax liability: Pension Expense Deferred Tax Liabilities, Investments Unrealized loss on investment securities Deferred Tax Liabilities, Gross Total deferred tax liability Deferred income tax (benefit) expense Deferred tax (benefit) expense Deferred Tax Assets, Net Net deferred tax asset Deferred tax assets: Deferred tax asset Deferred tax asset ESOP Inventory - effect on uniform capitalization Deferred Tax Assets, Gross Total deferred tax assets Deferred Tax Assets, Other Other Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Stock-based compensation Accrued expenses Property, plant and equipment - principally due to differences in depreciation methods Deferred tax liability Deferred tax liability Employer matching contibutions of 401(k) plan (percentage) Depreciation, Depletion, and Amortization [Policy Text Block] Depreciation Depreciation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-based Compensation Stock-based Compensation [Abstract] Dividends Payable, Date to be Paid Payable date of dividend Dividends payable Dividends Payable, Amount Per Share Dividend payable (in dollars per share) Dividends Payable [Table] Dividends Payable, Date of Record Record date for dividend payable Dividends Payable [Line Items] Dividends paid on common stock Dividends on common stock Basic EPS: Diluted EPS: Per Share Amounts Basic Diluted Net income per share: Calculation of EPS Dividend on allocated ESOP shares Qualified production activities Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Other State franchise tax, net of federal income tax benefit Income tax rate reconciliation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Stock-based compensation Effective tax rate U.S. federal statutory income tax rate Stock Options [Member] Period in which compensation cost will be recognized ESOP compensation expense Deferred tax benefit related to stock based compensation Unrecognized compensation costs Employee Stock Ownership Plan (ESOP) Name [Axis] Fair value of unreleased shares Employee Stock Ownership Plan (ESOP), Plan [Domain] Total shares held by the ESOP Allocated shares ESOP share allocation Committed-to-be-released shares Unreleased shares Stockholders Equity [Abstract] Equity Component [Domain] Excess tax benefits from share-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax benefits from share-based compensation Investment in Fair Value [Abstract] Investment in Fair Value Fair Value of Financial Instruments Furniture and fixtures [Member] Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Loss on disposal of assets Loss on cancellation of contract, reported in comprehensive income Domestic U.S. Customers [Member] Gross profit (loss) Gross profit Impairment of Long-Lived Assets Impairment of Long-Lived Assets Held-for-use Impairments of long-lived assets Statements of Comprehensive Income [Abstract] Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income before income taxes Provision for Income Taxes [Abstract] Provision for income taxes Provision for income taxes Provision for income taxes Income Tax Disclosure [Text Block] Provision for Income Taxes Income taxes paid Income Taxes Income tax receivable Income tax receivable Increase (Decrease) in Accounts Receivable (Increase) decrease in trade receivables, net Increase (decrease) in income taxes payable (Decrease) increase in accrued salaries, wages and commissions Increase (decrease) in accounts payable Decrease in other accrued expenses Changes in assets and liabilities: Increase (Decrease) in Inventories (Increase) decrease in inventories, net Increase (Decrease) in Income Taxes Receivable Decrease (increase) in income tax receivable Decrease in vacation accrual Increase (Decrease) in Prepaid Expense and Other Assets (Increase) decrease in prepaid expenses and other current assets (Decrease) increase in payroll and other taxes withheld and accrued Weighted average dilutive effect of stock options Inventories: Inventories: Costs related to contracts in process, net of progress payments of $19,626 and $142,616 as of June 30, 2015 and 2014, respectively Costs relating to contracts in process, net of advance payments of $142,616 in 2014 and $146,916 in 2013 Costs related to contracts in process, net of progress payments of $19,626 in fiscal 2015 and $142,616 in fiscal 2014 Inventory, Net Total inventories Work-in-process Work-in-process Raw materials Raw materials Investment, Policy [Policy Text Block] Investment Securities Interest and dividend income Interest income Investments Investments [Abstract] Schedule of contractual maturities of available-for-sale securities Investments [Abstract] Land [Member] Liabilities, Current Total current liabilities Liabilities, Noncurrent Total liabilities LIABILITIES AND STOCKHOLDERS' EQUITY LIABILITIES AND STOCKHOLDERS EQUITY Liabilities and Equity Total liabilities and stockholders' equity Maximum amount of Line of Credit Contracts in Process Machinery and equipment [Member] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Axis] Investment securities Investment securities Upper Range [Member] Lower Range [Member] Municipal bonds [Member] Nature of operations Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Cash Flows from Financing Activities: Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net income Net income (loss) Net income Net Income Cash Flows from Investing Activities: Cash Flows from Operating Activities: Recently Issued Accounting Standards Noncash Investing and Financing Items [Abstract] Supplemental Schedule of Non-cash Financing Activities: Nonoperating Income (Expense) Total other income Loan receivable Loan receivable Operating Income (Loss) Operating income Nature of operations [Abstract] Other income Other comprehensive income, tax portion Unrealized loss on investment securities Other comprehensive loss, net of tax Other Nonoperating Income Other Other Other Other comprehensive income, net of tax: Payments for Repurchase of Common Stock Purchase of treasury stock Payments of Ordinary Dividends, Common Stock Dividends on common stock Payments to Acquire Available-for-sale Securities Purchase of investment securities Payments to Acquire Property, Plant, and Equipment Additions to property, plant and equipment Defined benefit contributions and expenses Plan Name [Axis] Plan Name [Domain] Prepaid expenses and other current assets Prepaid expenses and other current assets Reclassifications Proceeds from loan receivable Proceeds from exercise of stock options Proceeds from sale/maturity of investment securities Sale of treasury stock Progress payments Summary of the original cost of property, plant and equipment Schedule of estimated useful lives of depreciable assets Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment [Abstract] Estimated useful lives of depreciated assets Property, Plant and Equipment, Type [Domain] Property, plant and equipment, net Property, plant and equipment, net Property, plant and equipment, net Property, plant and equipment, gross Property, Plant and Equipment Quarterly Financial Information (Unaudited) Quarterly Financial Information [Abstract] Range [Domain] Range [Axis] Related Parties Related Parties [Abstract] Retained Earnings [Member] Retained earnings Retained earnings Concentration of Credit Risk [Abstract] Exercisable, end of period Expected option life (in years) Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Non-vested, ending balance Non-vested, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Outstanding, ending Balance, beginning Vested Vested Vested or expected to vest, end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value Forfeited or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Forfeited or expired Forfeited or expired Net sales Sales Revenue [Member] Schedule of changes in non-vested stock options Schedule of stock option activity Schedule of weighted average assumptions for option awards Schedule of components of the provision for income taxes Schedule of effective income tax rates Schedule of deferred tax assets and liabilities Schedule of reconciliation of the numerators and denominators of basic and diluted per share computations Schedule of quarterly financial information Schedule of ESOP shares Selling, general and administrative expenses Weighted average fair value per share of options granted Exercised Stock-based compensation Options granted Granted Granted Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercisable, end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Forfeited or expired Stock options available for issuance Expected stock price volatility Authorized shares under plan Risk-free interest rate Weighted average assumptions to calculation option fair value Forfeited or expired Forfeited or expired Aggregate intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Exercisable, end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Vested or expected to vest, end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Exercisable, end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Outstanding end of period Equity Award [Domain] Options outstanding Outstanding, ending Balance, beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding, ending Balance, beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Vested or expected to vest, end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested or expected to vest, end of period Shares, Outstanding Balance, ending, common shares Balance, beginning, shares Summary of Significant Accounting Policies Statement [Line Items] Statements of Changes in Stockholders Equity [Abstract] Statements of Cash Flows Equity Components [Axis] Statement [Table] Balance Sheets [Abstract] Stock options exercised Sale of treasury stock to ESOP, shares Stock options exercised, shares Exercised Exercised Reduction of unearned ESOP shares Sale of treasury stock to ESOP Stockholders' Equity Stockholders' Equity Attributable to Parent Balance, ending Balance, beginning Total stockholders' equity Subsequent Event Type [Axis] Subsequent event [Member] Subsequent Event Subsequent Event [Abstract] Subsequent Event Type [Domain] Supplemental Schedule of Cash Flow Information: Accounts receivable and allowance for doubtful accounts Purchase of treasury stock, shares Shares repurchased Treasury stock, shares Treasury Stock [Member] Purchase of treasury stock Value of shares repurchased Treasury Stock, Value Cost of 667,187 and 661,764 shares of common stock in treasury as of June 30, 2015 and 2014, respectively Unearned ESOP Shares Unearned ESOP Shares Less: Unearned ESOP shares Use of Estimates Weighted average common shares issued during the period Weighted average number of shares outstanding: Weighted average common shares purchased during the period Weighted average ESOP shares earned during the period Denominator for basic earnings per common shares - Weighted average common shares Basic Weighted Average Number of Shares, Employee Stock Ownership Plan Shares Not Committed to be Released Unearned ESOP shares Denominator for diluted earnings per common shares - Weighted average common shares Diluted