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v3.20.1

Note 1 - Organization and Significant Accounting Policies (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($)
Number of Operating Segments | 2 |  |
Standard and Extended Product Warranty Accrual, Ending Balance | $ 569,000 | $ 582,000 |
Product Warranty Expense | $ 156,000 | 136,000 |
Multi Employer Plans Collective Bargaining Arrangement Number of Participants | 359 |  |
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants | 57.00% |  |
Operating Lease, Right-of-Use Asset | $ 7,014,000 | 0 |
Operating Lease, Liability, Total | 7,747,000 |  |
Retained Earnings (Accumulated Deficit), Ending Balance | $ (117,433,000) | $ (114,926,000) |
Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 7,664,000
Operating Lease, Liability, Total |  |  | 8,549,000
Retained Earnings (Accumulated Deficit), Ending Balance |  |  | $ (1,442,000)
Employee Benefit Related Adjustments Mexico [Member] |  |  |
Multi Employer Plans Collective Bargaining Arrangement Number of Participants | 319 |  |
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants | 51.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 27.00% | 40.00% |
Number of Major Customers | 2 | 2 |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member] |  |  |
Concentration Risk, Percentage | 17.00% | 18.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Detroit Diesel [Member] |  |  |
Concentration Risk, Percentage | 10.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Northrop Grumman [Member] |  |  |
Concentration Risk, Percentage |  | 22.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member] |  |  |
Concentration Risk, Percentage | 22.00% | 19.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer Detroit Diesel [Member] |  |  |
Concentration Risk, Percentage | 14.00% | 14.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Northrop Grumman [Member] |  |  |
Concentration Risk, Percentage | 11.00% | 14.00% |
Land Improvements, Buildings and Building Improvements [Member] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Machinery, Equipment, Furniture, and Fixtures [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Machinery, Equipment, Furniture, and Fixtures [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |

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