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Note 2 - Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Net sales of: |  |  |  |  |  |  |  |  |  |  |  |
Products |  | $ | 172,299 |  |  | $ | 193,016 |  |  | $ | 183,186 |
Tooling and machinery |  |  | 2,787 |  |  |  | 2,730 |  |  |  | 4,302 |
Engineering services |  |  | 4,287 |  |  |  | 2,635 |  |  |  | 2,967 |
Total net sales |  | $ | 179,373 |  |  | $ | 198,381 |  |  | $ | 190,455 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | Contract Liabilities |
|  | Years Ended |
|  | December 31, |
|  | 2020 |  |  | 2019 |
Deferred revenue - beginning of period |  | $ | 2,574 |  |  | $ | 2,507 |
Increases due to consideration received from customers |  |  | 2,673 |  |  |  | 3,216 |
Revenue recognized |  |  | (3,360 | ) |  |  | (3,149 | )
Deferred revenue - end of period |  | $ | 1,887 |  |  | $ | 2,574 |
|  | Contract Assets |
|  | Years Ended |
|  | December 31, |
|  | 2020 |  |  | 2019 |
Unbilled Receivables - beginning of period |  | $ | 72 |  |  | $ | 65 |
Increases due to revenue recognized - not invoiced to customers |  |  | 3,147 |  |  |  | 831 |
Decreases due to customer invoicing |  |  | (2,948 | ) |  |  | (824 | )
Unbilled Receivables - end of period |  | $ | 271 |  |  | $ | 72 |

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