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Note 1 - Organization and Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of Operating Segments |  | 2 |
Software Development Costs, Useful Life |  |  | 1 year 180 days
Capitalized Computer Software, Amortization |  |  | $ 1,089,000
Standard and Extended Product Warranty Accrual |  | $ 666,000 | $ 856,000
Multi Employer Plans Collective Bargaining Arrangement Number of Participants |  | 349 |
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants |  | 57.00% |
Collective Bargaining Agreements That Expire in Next 12 Months [Member] |  |  |
Multi Employer Plans Collective Bargaining Arrangement Number of Participants |  | 0 |
Employee Benefit Related Adjustments Mexico [Member] |  |  |
Multi Employer Plans Collective Bargaining Arrangement Number of Participants |  | 308 |
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants |  | 51.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk, Percentage |  | 30.00% | 41.00%
Number of Major Customers |  | 2 | 3
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member] |  |  |
Concentration Risk, Percentage |  | 15.00% | 15.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Northrop Grumman [Member] |  |  |
Concentration Risk, Percentage |  | 15.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Meritor [Member] |  |  |
Concentration Risk, Percentage |  |  | 14.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Tyco [Member] |  |  |
Concentration Risk, Percentage |  |  | 12.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member] |  |  |
Concentration Risk, Percentage |  | 13.00% | 12.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Meritor [Member] |  |  |
Concentration Risk, Percentage |  | 14.00% | 19.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Detroit Diesel [Member] |  |  |
Concentration Risk, Percentage |  | 13.00% | 10.00%
Sales Revenue, Net [Member] | Government Contracts Concentration Risk [Member] |  |  |
Concentration Risk, Percentage |  |  | 3.00%
Scenario, Forecast [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |
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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