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Note 11 - Impact of COVID-19 (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets, Net, Ending Balance | $ 17,390 | $ 9,209
Covid-19 [Member] |  |
Decrease in Sales | 11,000 |
Decrease in Operating Profit | 4,500 |
Covid-19 [Member] | Backlog, Excluding Excell [Member] |  |
Finite-Lived Intangible Assets, Net, Ending Balance | 53,166 |
Finite-Lived Intangible Assets, Period Increase (Decrease), Total | $ 13,874 |
Finite-Lived Intangible Assets, Period Increase (Decrease), Percentage | 35.30% |

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