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v3.20.4

Note 1 - Organization and Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of Operating Segments | 2 |
Standard and Extended Product Warranty Accrual, Ending Balance | $ 638,000 | $ 569,000
Product Warranty Expense | $ 294,000 | $ 156,000
Multi Employer Plans Collective Bargaining Arrangement Number of Participants | 386 |
Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Participants, Percentage | 58.00% |
Employee Benefit Related Adjustments Mexico [Member] |  |
Multi Employer Plans Collective Bargaining Arrangement Number of Participants | 350 |
Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Participants, Percentage | 53.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |
Concentration Risk, Percentage | 53.00% | 27.00%
Number of Major Customers | 4 | 2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member] |  |
Concentration Risk, Percentage | 17.00% | 17.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Detroit Diesel [Member] |  |
Concentration Risk, Percentage | 14.00% | 10.00%
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 Sistemas [Member] |  |
Concentration Risk, Percentage | 14.00% | 22.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer Detroit Diesel [Member] |  |
Concentration Risk, Percentage | 12.00% | 14.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Northrop Grumman [Member] |  |
Concentration Risk, Percentage | 22.00% | 11.00%
Land Improvements, Buildings and Building Improvements [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 40 years |
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 |

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