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Note 1 - Organization and Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Software Development Costs, Useful Life |  | 1 year 180 days
Capitalized Computer Software, Net |  | $ 1,597,000
Capitalized Computer Software, Amortization | $ 1,089,000 | 2,090,000
Standard and Extended Product Warranty Accrual | 856,000 | 830,000
Product Warranty Expense | 73,000 | 159,000
Extended Product Warranty Accrual, Increase for Warranties Issued | 162,000 | 495,000
Extended Product Warranty Accrual | 155,000 | 333,000
Other Liabilities | $ 7,000 | $ 162,000
Multi Employer Plans Collective Bargaining Arrangement Number of Participants | 335 |
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants | 55.00% |
Reclassification from Assets to Reduce Long-term Debt [Member] | December 31, 2015 [Member] |  |
Prior Period Reclassification Adjustment | $ 1,220,000 |
Employee Benefit Related Adjustments Mexico [Member] |  |
Multi Employer Plans Collective Bargaining Arrangement Number of Participants | 196 |
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants | 32.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |
Concentration Risk, Percentage | 41.00% | 37.00%
Number of Major Customers | 3 | 3
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member] |  |
Concentration Risk, Percentage | 15.00% | 16.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Meritor [Member] |  |
Concentration Risk, Percentage | 14.00% | 11.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Tyco [Member] |  |
Concentration Risk, Percentage | 12.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer ITT Exelis [Member] |  |
Concentration Risk, Percentage |  | 10.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member] |  |
Concentration Risk, Percentage | 12.00% | 11.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Meritor [Member] |  |
Concentration Risk, Percentage | 19.00% | 30.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Detroit Diesel [Member] |  |
Concentration Risk, Percentage | 10.00% | 10.00%
Sales Revenue, Net [Member] | Government Contracts Concentration Risk [Member] |  |
Concentration Risk, Percentage | 3.00% | 5.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member] |  |
Multi Employer Plans Collective Bargaining Arrangement Number of Participants | 139 |
Land, Buildings and Improvements [Member] |  |
Property, Plant and Equipment, Useful Life | 40 years |
Furniture and Fixtures [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Furniture and Fixtures [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life | 15 years |
Machinery and Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life |  | 3 years
Machinery and Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life |  | 15 years

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