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Note 3 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets, Gross $ 65,294 $ 65,679
Total amortizable intangible assets (36,596) (32,782)
Finite-Lived Intangible Assets, Net 28,698 32,897
Indefinite-lived intangible assets: 243 254
Total intangible assets, Net $ 28,941 33,151
Distribution Agreements/Customer Relationships [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 8 years 1 month 6 days  
Finite-Lived Intangible Assets, Gross $ 17,874 18,237
Total amortizable intangible assets (8,482) (7,746)
Finite-Lived Intangible Assets, Net $ 9,392 10,491
Existing Technology [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 4 years 4 months 24 days  
Finite-Lived Intangible Assets, Gross $ 38,861 38,761
Total amortizable intangible assets (23,179) (20,674)
Finite-Lived Intangible Assets, Net $ 15,682 18,087
Trade Names and Patents [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 4 years 8 months 12 days  
Finite-Lived Intangible Assets, Gross $ 8,559 8,681
Total amortizable intangible assets (4,935) (4,362)
Finite-Lived Intangible Assets, Net $ 3,624 $ 4,319
[1] Weighted average life in years as of September 30, 2021