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Note 1 - Organization and Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019
Number of Operating Segments | 2 |  |
Standard and Extended Product Warranty Accrual, Ending Balance | $ 659,000 | $ 638,000 |
Product Warranty Expense | $ 252,000 | $ 294,000 |
Multi Employer Plans Collective Bargaining Arrangement Number of Participants | 404 |  |
Multiemployer Plan, Employees Covered by Collective-Bargaining Arrangement, Subject to Expiration in 12 Months | 29 |  |
Employee Benefit Related Adjustments Mexico [Member] |  |  |
Multi Employer Plans Collective Bargaining Arrangement Number of Participants | 375 |  |
Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Entity's Employees, Percentage | 59.00% |  |
Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Participants, Percentage | 55.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Three Customers [Member] |  |  |
Concentration Risk, Percentage | 50.00% |  |
Number of Major Customers | 3 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Detroit Diesel [Member] |  |  |
Concentration Risk, Percentage | 25.00% | 14.00% | 10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer ADI [Member] |  |  |
Concentration Risk, Percentage | 13.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Subcom [Member] |  |  |
Concentration Risk, Percentage | 11.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Four Customers [Member] |  |  |
Concentration Risk, Percentage |  | 53.00% |
Number of Major Customers |  | 4 |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member] |  |  |
Concentration Risk, Percentage |  | 17.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | CECO Peerless [Member] |  |  |
Concentration Risk, Percentage |  | 11.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Tremec [Member] |  |  |
Concentration Risk, Percentage |  | 11.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer Detroit Diesel [Member] |  |  |
Concentration Risk, Percentage | 18.00% | 12.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member] |  |  |
Concentration Risk, Percentage | 21.00% | 14.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Northrop Grumman [Member] |  |  |
Concentration Risk, Percentage | 16.00% | 22.00% |
Machinery, Equipment, Furniture, and Fixtures [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Machinery, Equipment, Furniture, and Fixtures [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 15 years |  |
Capitalized Implementation Costs [Member] |  |  |
Prepaid Expense and Other Assets | $ 89,000 | $ 60,000 |

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