Key Bank National Association [Member] Lender Name [Axis] One Customer [Member] Customer [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 Entity Filer Category Entity Common Stock, Shares Outstanding Trading Symbol Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] Assets Current Assets: Cash and cash equivalents Accounts receivable-trade, net of allowance for doubtful accounts of $4,000 and $4,000 Inventories, net Prepaid expenses and other current assets Total current assets Property, plant and equipment, net Total assets Liabilities and Stockholders' Equity Current liabilities: Accounts payable Customer deposits Accrued payroll and related expenses Accrued compensated absences Notes payable - short term Other current liabilities Total current liabilities Notes payable -long term Total other liabilities Total liabilities Stockholders' Equity: Common stock, $.10 par value Authorized 5,000,000 shares, Issued 4,324,140 shares in 2016 and 2015, Outstanding 2,581,007 shares in 2016 and 2,581,466 in 2015 Additional paid-in capital Accumulated deficit Common stock in treasury, at cost 1,743,133 shares in 2016 and 1,742,674 shares in 2015 Total stockholders' equity Total liabilities and stockholders' equity Accounts receivable, allowance for doubtful accounts Common stock, par value Common stock, shares authorized Common stock, shares, issued Common stock, shares, outstanding Treasury stock, shares Income Statement [Abstract] Net sales Cost of goods sold Gross profit Selling, general and administrative expenses Income (loss) from operations Other income (expense), net Income (loss) before income taxes (Benefit) provision for income taxes Net income (loss) Per share data: Basic and diluted earnings (loss) per common share Shares used in computing net earnings (loss) per common share: Basic and diluted Statement of Cash Flows [Abstract] Cash flows from operating activities: Net loss Adjustments to reconcile net loss to net cash provided by operating activities: Depreciation Change in operating assets and liabilities: Accounts receivable-trade Inventories Prepaid expenses and other assets Accounts payable and customer deposits Accrued payroll and related expenses and compensated absences Other current liabilities Net cash provided by operating activities Cash flows from investing activities: Property, plant and equipment purchased Net cash used in investing activities Cash flows from financing activities: Repayment of note payable Purchase of treasury stock Net cash used in financing activities Increase (decrease) in cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental Schedule of Cash Flow Information: Interest paid Accounting Policies [Abstract] Summary of Significant Accounting Policies Segment Reporting [Abstract] Industry Segment Data Inventory Disclosure [Abstract] Inventories Income Tax Disclosure [Abstract] Income Taxes Commitments and Contingencies Disclosure [Abstract] Legal Matters Investments, All Other Investments [Abstract] Fair Value of Financial Instruments Risks and Uncertainties [Abstract] Significant Customers Debt Disclosure [Abstract] Notes Payable Earnings Per Share [Abstract] Earnings Per Share Accounting Changes and Error Corrections [Abstract] Recent Accounting Pronouncements Schedule of Inventories Net of Reserve for Obsolescence Reserve for obsolescence Raw materials and stock parts Work-in-process Finished goods Inventory net Statement [Table] Statement [Line Items] Percentage of sales Loan term Loan amount Loan maturity date Percentage of interest rate Outstanding total amount Interest accrued Dividends Dilutive potential shares outstanding Increase Decrease In Accounts Payable And Customer Deposits Key Bank National Association [Member] One Customer [Member] Assets, Current Assets [Default Label] Liabilities, Current Liabilities, Noncurrent Liabilities Treasury Stock, Value Stockholders' Equity Attributable to Parent Liabilities and Equity Gross Profit Operating Income (Loss) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Increase (Decrease) in Accounts Receivable Increase (Decrease) in Inventories Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Other Operating Liabilities Net Cash Provided by (Used in) Operating Activities Payments to Acquire Property, Plant, and Equipment Net Cash Provided by (Used in) Investing Activities Repayments of Notes Payable Payments for Repurchase of Common Stock Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Debt Instrument, Face Amount