Accounts Receivable Concentration Risk Benchmark [Axis] Building and Building Improvements Property, Plant and Equipment, Type [Axis] Minimum Range [Axis] Maximum Machinery and Equipment Furniture and Fixtures Municipal Bonds Investment Type [Axis] Certificates of Deposit Cash and Cash Equivalents [Axis] Land Building and Improvements Customer Concentration - Domestic Customer Concentration - Foreign Shareholder Rights Plan Class of Warrant or Right [Axis] 2007 Plan Plan Name [Axis] Stock Option Plans Award Type [Axis] 2000 Plan Common Shares Class of Stock [Axis] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Is Entity a Well-known Seasoned Issuer? Is Entity a Voluntary Filer? Is Entity's Reporting Status Current? Entity Filer Category Entity Common Stock, Shares Outstanding Entity Public Float Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] ASSETS Cash and cash equivalents Investment securities Trade accounts receivable, net Income tax receivable Inventories: Raw materials Work-in-process Costs relating to contracts in process, net of advance payments of $418,897 at December 31, 2012 and $511,502 at June 30, 2012 Total inventories Deferred income taxes Prepaid expenses and other current assets Total current assets Property, plant and equipment, net Loan receivable Total assets LIABILITIES AND STOCKHOLDERS' EQUITY Accounts payable Accrued expenses: Salaries, wages and commissions Vacation ESOP payable Other Payroll and other taxes withheld and accrued Income taxes payable Total current liabilities Deferred income taxes Total liabilities Common stock, par value $.33-1/3 per share. Authorized 10,000,000 shares; Issued 3,029,874 shares on December 31, 2012 and June 30, 2012. Outstanding 2,344,543 and 2,320,822 (includes 126,666 and 136,666 Unearned ESOP Shares on December 31, 2012 and June 30, 2012, respectively) Capital in excess of par value Accumulated other comprehensive income/loss Retained earnings [TotalStockholdersEquityBeforyEsopAndTreasuryStock] Less: Unearned ESOP shares; Cost of 709,052 and 708,914 shares of common stockin treasury in 2012 and 2011, respectively Treasury shares, cost of 685,331 and 709,052 shares on December 31, 2012 and June 30, 2012, respectively Total stockholders' equity Total liabilities and stockholders' equity Advance payments of contracts in process Common stock, par value Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Unearned ESOP, shares Treasury stock, shares Income Statement [Abstract] Net sales Cost of sales Gross profit Selling, general and administrative expenses Operating income Other income Interest and dividend income Other Total other income Income before income taxes Provision for income taxes Net income Other comprehensive income, net of tax: Unrealized gain on investment securities Total comprehensive income Net income per share: Basic Diluted Weighted average number of shares outstanding: Basic Diluted Dividends per share: Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: Net income Adjustments to reconcile net income to net cash provided by operating activities: Excess tax benefits from share-based compensation Stock-based compensation Depreciation ESOP compensation expense Loss on disposal of assets Deferred income tax benefit Changes in assets and liabilities: (Increase) decrease in trade receivable, net Increase in income taxes receivables Increase in inventories Decrease in prepaid expenses and other current assets (Decrease) increase in accounts payable Decrease in accrued salaries, wages and commissions Decrease in vacation accrual Decrease in ESOP payable Increase in other accrued expenses Increase in payroll and other taxes withheld and accrued Decrease in income taxes payable Net cash provided by operating activities Cash Flows From Investing Activities: Additions to property, plant and equipment Proceeds from loan receivable Purchase of investment securities Proceeds from maturity of investment securities Net cash used in investing activities Cash Flows From Financing Activities: Sale of treasury stock Dividends on common stock Purchase of treasury stock Proceeds from exercise of stock options Excess tax benefits from share-based compensation Net cash used in financing activities Decrease in cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental Schedule of Cash Flow Information: Income taxes paid Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Earnings Per Share [Abstract] Net Income per Share Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-based Compensation Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Accounting Changes and Error Corrections [Abstract] Recently Issued Accounting Standards Employee Stock Ownership Plan Employee Stock Ownership Plan Stock-Based Compensation Tables Schedule of weighted average assumptions for option awards Schedule of stock option activity Employee Stock Ownership Plan Tables Schedule of ESOP shares Statement [Table] Statement [Line Items] Vesting period of options Service period for vesting of options Contractual life of options Stock based compensation expense Deferred tax benefit related to stock based compensation Unrecognized compensation costs Period in which compensation cost will be recognized Deferred tax benefit related to unrecognized compensation costs Authorized shares under plan Outstanding, ending Options granted Intrinsic values of the options exercised Special cash dividend, per share Stock-Based Compensation Details Weighted Average Assumptions Dividend yield Expected stock price volatility Risk-free interest rate Expected option life (in years) Weighted average fair value per share of options granted Number of Shares Subject to Option Balance, beginning Granted Exercised Forfeited or expired Vested or expected to vest, end of period Exercisable, end of period Weight Average Exercise Price Balance, beginning Granted Exercised Forfeited or expired Outstanding, ending Vested or expected to vest, end of period Exercisable, end of period Weighted Average Remaining Contractual Term Balance, beginning Granted Outstanding, ending Vested or expected to vest, end of period Exercisable, end of period Aggregate Intrinsic Value Outstanding end of period Vested or expected to vest, end of period Exercisable, end of period Employee Stock Ownership Plan Details Narrative Plan description Number of hours worked per year Employee Stock Ownership Plan Details Allocated shares Committed-to-be-released shares Unreleased shares Total shares held by the ESOP Fair value of unreleased shares Total of all stockholders' equity (deficit) items, before ESOP and Treasury stock. The number of Unearned ESOP shares. The entire disclosure of employee stock ownership plan. Reflects the percentage that revenues in the period from one or more significant foreign customers is to net revenues, as defined by the entity, such as total net revenues, product line revenues, segment revenues. The risk is the materially adverse effects of loss of a significant foreign customer. Name of the class or type of right outstanding. Minimum number of hours worked per year for nonunion employees to participate in ESOP. Name of the equity-based compensation arrangement plan. Name of the equity-based compensation arrangement plan. The contractual life of stock options under the Company's plans. The benefit during the period in the entity's deferred tax assets and liabilities attributable to share based compensation as determined by applying enacted tax laws. Amount of deferred tax benefit attributable to unrecognized share-based compensation. Gross number of share options (or share units) granted. The contractual life of stock options under the Company's plans. The period over which compensation costs related to stock option awards are expected to be recognized as expense. The per share amount of a special cash dividend that has been paid. Inventory, Net Assets, Current Assets Liabilities, Current Deferred Tax Liabilities, Net, Noncurrent Liabilities, Noncurrent TotalStockholdersEquityBeforyEsopAndTreasuryStock Unearned ESOP Shares Treasury Stock, Value Stockholders' Equity Attributable to Parent Liabilities and Equity Gross Profit Operating Income (Loss) Other Nonoperating Income Nonoperating Income (Expense) Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Diluted Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities Gain (Loss) on Disposition of Assets Increase (Decrease) in Accounts Receivable Increase (Decrease) in Income Taxes Receivable Increase (Decrease) in Inventories Increase (Decrease) in Prepaid Expense and Other Assets Net Cash Provided by (Used in) Operating Activities Payments to Acquire Property, Plant, and Equipment Payments to Acquire Short-term Investments Net Cash Provided by (Used in) Investing Activities Payments of Ordinary Dividends, Common Stock Payments for Repurchase of Other Equity Net Cash Provided by (Used in) Financing Activities EmployeeStockOwnershipPlanTextBlock Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodContractualTerm Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value