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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Sales [Member] | Five Largest Customers [Member] |  |  |
Concentration Risk, Percentage | 33.00% | 35.00% | 40.00%
Sales [Member] | General Motors Company [Member] |  |  |
Concentration Risk, Percentage | 11.00% | 15.00% | 19.00%
Revenue Provided to the Automobile Manufacturing Industry [Member] | Other Manufacturers [Member] |  |  |
Concentration Risk, Percentage | 27.00% | 30.00% | 40.00%
Accounts Receivable [Member] |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 31,049,000 | $ 25,593,000 |

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