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Note 10 - Segment Information, Significant Customers, Industry Concentration and Geographic Areas (Details Textual) - Customer Concentration Risk [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Sales [Member] | Five Largest Customers [Member] |  |  |
Concentration Risk, Percentage | 34.00% | 39.00% | 33.00%
Sales [Member] | General Motors Company [Member] |  |  |
Concentration Risk, Percentage | 12.00% | 13.00% | 11.00%
Revenue Provided to the Automobile Manufacturing Industry [Member] | Other Manufacturers [Member] |  |  |
Concentration Risk, Percentage | 30.00% | 31.00% | 27.00%
Accounts Receivable [Member] |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 24,665,000 | $ 36,622,000 |

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