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%

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant