Document and Entity Information Document And Entity Information [Abstract] Statement [Table] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Filer Category Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Common Stock, Shares Outstanding Consolidated Balance Sheets [Abstract] Assets Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Accounts Receivable, Net, Current Accounts receivable-trade, net of allowance for doubtful accounts of $26,000 and $26,000 Accounts Receivable, Net, Current, Total Income Taxes Receivable, Current Federal and state income tax recoverable Inventory, Net Inventories, net Inventories, net Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current, Total Prepaid expenses and other current assets Assets, Current Total current assets Total current assets Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, plant and equipment, net Property, Plant and Equipment, Net, Total Asset Total assets Total assets Liabilities and Stockholders' Equity Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Customer Deposits, Current Customer deposits Employee-related Liabilities, Current Accrued payroll and related expenses Employee-related Liabilities, Current, Total Compensated Absences Liability Accrued compensated absences Compensated Absences Liability, Total Cash dividends payable. Cash Dividends Payable Cash dividends payable Other Liabilities, Current Other current liabilities Other Liabilities, Current, Total Liabilities, Current Total current liabilities Total current liabilities Liabilities Total liabilities Total liabilities Stockholders' Equity: Stockholders' Equity: Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock, $.10 par value Authorized 5,000,000 shares, Issued 4,324,140 shares in 2012 and 4,324,140 in 2011, Outstanding 2,585,453 shares in 2012 and 2,586,227 shares in 2011 Common stock, $.10 par value Authorized 5,000,000 shares, Issued 4,324,140 shares in 2011 and 2010, Outstanding 2,586,227 shares in 2012 and 2,586,227 shares in 2011 Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained earnings Retained Earnings (Accumulated Deficit), Total Treasury Stock, Value Common stock in treasury, at cost 1,738,687 shares in 2012 and 1,737,913 shares in 2011 Treasury Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Common stock in treasury, at cost Stockholders' Equity Attributable to Parent Balance Balance Total stockholders' equity Total stockholders' equity Liabilities And Stockholders Equity Balance Total liabilities and stockholders' equity Total liabilities and stockholders' equity Allowance for Doubtful Accounts Receivable, Current Allowance for Doubtful Accounts Receivable, Current, Ending Balance Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Accounts receivable, allowance for doubtful accounts Common stock, par value Common stock, shares authorized Common stock, shares, issued Common Stock, Shares, Issued, Total Common stock, shares, outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Treasury stock, shares Treasury Stock, Shares, Ending Balance Treasury Stock, Shares, Beginning Balance Consolidated Statements Of Operations [Abstract] Net sales Revenue, Net, Total Cost of goods sold Cost of goods sold Cost of Goods Sold, Total Gross Profit Gross profit Selling, general and administrative expenses Selling, general and administrative expenses Selling, General and Administrative Expense, Total Operating Income (Loss) Iincome from operations Other income (net), principally interest Other income (net) Other income (net) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income before income taxes Provision (benefit) for income taxes Benefit for income taxes Income Tax Expense (Benefit), Total Net income Net income Net Income Per share data: Earnings Per Share, Basic and Diluted Earnings Per Share, Basic and Diluted, Total Basic and diluted earnings per share The average number of shares or units issued and outstanding that are used in calculating basic and diluted EPS. Weighted Average Number Of Shares Outstanding Diluted And Basic Shares used in computing net earnings (loss) per share: Shares used in computing net earnings per share: Consolidated Statements Of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments to reconcile net income to net cash provided by (used in) operating activities: Depreciation and amortization Depreciation Depreciation, Depletion and Amortization, Total Gain (Loss) on Sale of Property Plant Equipment Gain on sale of fixed assets Gain (Loss) on Sale of Property Plant Equipment, Total Provision for Doubtful Accounts Provision for doubtful accounts Change in assets and liabilities: Change in operating assets and liabilities: Accounts receivable - trade Accounts receivable-trade Increase (Decrease) in Income Taxes Federal and state income tax recoverable Increase Decrease In Inventories Inventories Inventories Increase (Decrease) in Inventories, Total Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets, Total Increase Decrease In Accounts Payable And Customer Deposits Increase Decrease In Accounts Payable And Customer Deposits Accounts payable and customer deposits Accounts payable and customer deposits Accrued payroll, compensated absences and related expenses Accrued payroll and related expenses and compensated absences Increase (Decrease) in Employee Related Liabilities, Total Other current liabilities Increase (Decrease) in Other Operating Liabilities, Total Net cash provided by operating activities Net cash provided by operating activities Cash flows from investing activities: Payments to Acquire Property, Plant, and Equipment Property, plant and equipment purchased Payments to Acquire Property, Plant, and Equipment, Total Capital expenditures Proceeds from Sale of Productive Assets Proceeds from sale of fixed assets Proceeds from Sale of Productive Assets, Total Net cash used in investing activities Net cash used in investing activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Total Cash flows from financing activities: Purchase of treasury stock Purchase of treasury stock Net cash used in financing activities Net cash used in financing activities Net cash used in financing activities Net increase (decrease) in cash and cash equivalents (Decrease) increase in cash and cash equivalents (Decrease) increase in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental Schedule of Cash Flow Information: Income Taxes Paid, Net Income taxes paid Income Taxes Paid, Net, Total Summary Of Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Summary Of Significant Accounting Policies Industry Segment Data [Abstract] Segment Reporting Disclosure [Text Block] Industry Segment Data Inventories [Abstract] Inventory Disclosure [Text Block] Inventories Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Legal Matters [Abstract] Legal Matters and Contingencies [Text Block] Legal Matters Fair Value Of Financial Instruments [Abstract] Fair Value Disclosures [Text Block] Fair Value Of Financial Instruments Significant Customers Significant Customers [Abstract] Significant Customers Significant Customers' Significant Customers Cash Dividends [Abstract] Cash Dividends TextBlock Cash Dividends TextBlock Cash Dividends Schedule of Inventory, Current [Table Text Block] Schedule Of Inventories Net Of Reserve For Obsolescence Inventory, Raw Materials and Supplies, Net of Reserves Raw materials and stock parts Inventory, Raw Materials and Supplies, Net of Reserves, Total Inventory, Work in Process, Net of Reserves Work-in-process Inventory, Finished Goods, Net of Reserves Finished goods Inventory Adjustments Reserve for obsolescence Inventory Adjustments, Total Other Accrued Liabilities, Current Accrued action in other current liabilities Entity-Wide Revenue, Major Customer, Percentage Percentage of sales to one customer Dividends, Common Stock, Cash Cash dividend payment Dividends, Common Stock Dividends, Common Stock, Total Cash dividend total