2007 Plan Plan Name [Axis] Stock Option Plans Award Type [Axis] 2000 Plan Common Stock Class of Stock [Axis] Equity Components [Axis] Capital in Excess of Par Value Accumulated Other Comprehensive Income Retained Earnings Treasury Stock Unearned ESOP Shares Building and Building Improvements Property, Plant and Equipment, Type [Axis] Lower Range Range [Axis] Upper Range Machinery and Equipment Furniture and Fixtures Land Building and Improvements Certificates of Deposit Cash and Cash Equivalents [Axis] Municipal Bonds Major Types of Debt and Equity Securities [Axis] Customer Concentration - Domestic Concentration Risk Benchmark [Axis] Customer Concentration - Foreign Shareholder Rights Plan Class of Warrant or Right [Axis] Employee Stock Ownership Plan Employee Stock Ownership Plan (ESOP) Name [Axis] Accounts Receivable 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 Common stock, per share value Entity Public Float Entity Common stock, closing sale price Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] ASSETS Cash and cash equivalents Investment securities Trade accounts receivable, net Inventories: Raw materials Work-in-process Costs relating to contracts in process, net of progress payments of $146,916 in 2013 and $511,502 in 2012 Total inventories Deferred tax asset 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 Other Payroll and other taxes withheld and accrued Income taxes payable Total current liabilities Deferred tax liability Total liabilities Common stock, par value $.33-1/3 per share. Authorized 10,000,000 shares; Issued 3,029,874 shares in 2013 and 2012. Outstanding 2,343,690 and 2,320,822 in 2013 and 2012, respectively (includes 116,666 and 136,666 Unearned ESOP Shares) Capital in excess of par value Accumulated other comprehensive income/loss Retained earnings [TotalStockholdersEquityBeforyEsopAndTreasuryStock] Less: Unearned ESOP shares Cost of 685,184 and 709,052 shares of common stock in treasury in 2013 and 2012, respectively Total stockholders' equity Total liabilities and stockholders' equity Progress payments of costs related to 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 (loss) gain on investment securities Total comprehensive income Net income per share: Basic Diluted Weighted average number of shares outstanding: Basic Diluted Statement [Table] Statement [Line Items] Balance, beginning Balance, beginning, shares Net income Other comprehensive income, net of tax Total comprehensive income Stock options exercised Stock options exercised, shares Stock option expense Dividends paid on common stock Tax effect of stock options exercised Sale of treasury stock to ESOP Sale of treasury stock to ESOP, shares Purchase of treasury stock Purchase of treasury stock, shares Reduction of unearned ESOP shares Balance, ending Balance, ending, common shares Statement of Stockholders' Equity [Abstract] Other comprehensive income, tax portion Dividends paid per share Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: 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 Decrease (increase) in inventories, net (Increase) decrease in prepaid expenses and other current assets Decrease in accounts payable (Decrease) increase in accrued salaries, wages and commissions Increase in other accrued expenses Increase in vacation accrual Increase in payroll and other taxes withheld and accrued Increase (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 sale/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) increase in cash and cash equivalents Cash and cash equivalents, beginning of year Cash and cash equivalents, end of year Supplemental Schedule of Cash Flow Information: Income taxes paid Nature Of Operations Nature of operations Summary Of Significant Accounting Policies Summary of Significant Accounting Policies Investment In Fair Value Investment in Fair Value Contractors [Abstract] Contracts in Process Property, Plant and Equipment [Abstract] Property, Plant and Equipment Compensation and Retirement Disclosure [Abstract] Pension Expense Income Tax Disclosure [Abstract] Provision for Income Taxes Significant Customers Significant Customers Stock Rights Plan Stock Rights Plan Employee Stock Ownership Plan Employee Stock Ownership Plan Stock-Based Compensation Stock-based Compensation Financial Instrumentsconcentration Of Credit Risk Financial Instruments/Concentration of Credit Risk Related Party Transactions [Abstract] Related Parties Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Stockholders' Equity Attributable to Parent [Abstract] Stockholders' Equity Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information (Unaudited) Accounting Policies [Abstract] Inventory Valuation, Cost Estimation and Revenue Recognition Depreciation Income Taxes Cash and Cash Equivalents Investment Securities Accounts receivable and allowance for doubtful accounts Per Share Amounts Comprehensive Income Use of Estimates Investment Tax Credits Reclassifications Recently Issued Accounting Standards Impairment of Long-Lived Assets Concentrations of Risk Summary Of Significant Accounting Policies Tables Schedule of estimated useful lives of depreciable assets Investment In Fair Value Tables Schedule of gross unrealized gains, gross unrealized losses and fair value of available-for-sale securities Schedule of contractual maturities of available-for-sale securities Contracts In Process Tables Schedule of contracts in process Property Plant And Equipment Tables Summary of the original cost of property, plant and equipment Provision For Income Taxes Tables Schedule of components of the provision for income taxes Schedule of effective income tax rates Schedule of deferred tax assets and liabilities Employee Stock Ownership Plan Tables Schedule of ESOP shares Stock-Based Compensation Tables Schedule of weighted average assumptions for option awards Schedule of stock option activity Schedule of changes in non-vested stock options Stockholders Equity Tables Schedule of reserved common shares for future issuance Schedule of reconciliation of the numerators and denominators of basic and diluted per share computations Quarterly Financial Information Tables Quarterly financial information Summary Of Significant Accounting Policies Details Narrative Allowance for doubtful accounts Estimated useful lives Amortized Cost Gross Unrealized Gain Gross Unrealized Losses Fair Value Investment In Fair Value Details 1 Years to Maturity Less than One Year One to Five Years Total Contracts In Process Details Narrative Costs relative to uncompleted contracts Contracts In Process Details Gross contract value Property, plant and equipment, gross Accumulated depreciation Property, plant and equipment, net Pension Expense Details Narrative Defined benefit contributions and expenses Increase in contribution, hourly rate Percentage of contributions greater than total contributions Employer matching contibutions of 401(k) plan (percentage) Employer matching contibutions of 401(k) plan Provision For Income Taxes Details Current tax expense - federal Current tax expense - state Deferred tax benefit Provision for income taxes Provision For Income Taxes Details 1 U.S. federal statutory income tax rate Increase (reduction) in rate resulting from: State franchise tax, net of federal income tax benefit ESOP cost versus Fair Market Value Dividend on allocated ESOP shares Qualified production activities Stock-based compensation Other Effective tax rate Provision For Income Taxes Details 2 Deferred tax assets: Accrued expenses ESOP Stock-based compensation Inventory - effect on uniform capitalization Other Total deferred tax assets Deferred tax liabilities: Unrealized gain on investment securities Property, plant and equipment - principally due to differences in depreciation methods Total deferred tax liabilities Net deferred tax asset Export sales Product sales (percentage) Number of customers Product sold Customer location Description of the plan Type of security Date purchased rights distributed Expiration date of the plan Number of shares each right give the holder the right to purchase Exercise price (per share) Beneficial ownership that causes rights to be exercisable (percentage) Sale of assets or earning power to another person where rights become exercisable (percentage) Redemption of right (per right) Plan description Number of hours worked per year Allocated shares Unreleased shares Total shares held by the ESOP Fair value of unreleased shares 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 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 Other Liabilities Disclosure [Abstract] Average Grant Date Fair Value Balance, beginning Vested Forfeited or expired Outstanding, ending Weighted Average Number of Shares Subject to Option Non-vested, beginning balance Vested Forfeited or expired Non-vested, ending balance Accounts receivable (percentage) Stockholders Equity Details Stock options outstanding Stock options available for issuance Number of common shares reserved Stockholders Equity Details 1 Numerator: Net Income Denominator: Basic EPS: Common shares outstanding, beginning of period Unearned ESOP shares Weighted average common shares issued during the period 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 Diluted EPS: Weighted average dilutive effect of issued or forfeited shares Denominator for diluted earnings per common shares - Weighted average common shares Quarterly Financial Information Details Gross profit Net income per share Amount of deferred tax benefit attributable to unrecognized share-based compensation. Amount of contributions which the employer contributes in a matching contribution to a defined contribution 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. Minimum number of hours worked per year for nonunion employees to participate in ESOP. The closing price per share of security quoted in same currency as Trading currency. Value of contracts before progress payments and reserves of inventories associated with long-term contracts or programs. 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. Disclosure of accounting policy for recognizing investment tax credits. Schedule of contracts in process. The schedule of common shares reserved for future issuance. Gross number of share options (or share units) granted. The contractual life of stock options under the Company's plans. The disclosure for revenues in the period from one or more significant customers. The entire disclosure for stock right plans. Total of all stockholders' equity (deficit) items, before ESOP and Treasury stock. Name of the equity-based compensation arrangement plan. Name of the equity-based compensation arrangement plan. Information pertaining to unearned employee stock ownership plan shares. 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. The number of customers. General descriptive information regarding an arrangement under which shareholders receive: (a) equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Expiration date of the plan in CCYY-MM-DD format. The specified number of shares that each purchase right gives the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. The percentage of the Company's stock that is considered beneficial ownership. The percentage of the Company's assets that are sold or earning power to another person that triggers stock rights. Information by name of employee stock ownership plan. Revenue from export sales. The entire disclosure for employee stock ownership plan. The hourly increase in pension contributions based upon the negotiated union contract. Percentage of union pension contributions as compared to total contributions. Disclosure of information about useful life of physical assets used in the normal conduct of business and not intended for resale. Inventory, Net Assets, Current Assets Liabilities, Current Liabilities, Noncurrent TotalStockholdersEquityBeforyEsopAndTreasuryStock Unearned ESOP Shares [Default Label] Treasury Stock, Value Stockholders' Equity Attributable to Parent Liabilities and Equity Operating Income (Loss) Other Nonoperating Income Nonoperating Income (Expense) Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Shares, Outstanding Excess Tax Benefit from Share-based Compensation, Operating Activities Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Increase (Decrease) in Accounts 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 Available-for-sale Securities Net Cash Provided by (Used in) Investing Activities Payments for Repurchase of Common Stock Net Cash Provided by (Used in) Financing Activities SignificantCustomersTextBlock StockRightsPlanTextBlock EmployeeStockOwnershipPlanAbstract EmployeeStockOwnershipPlanTextBlock Depreciation, Depletion, and Amortization [Policy Text Block] Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred Tax Assets, Other Deferred Tax Assets, Gross Deferred Tax Liabilities, Gross Deferred Tax Assets, Net 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 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 Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares