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Note 3 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets, Gross $ 65,431 $ 65,679
Total amortizable intangible assets (33,788) (32,782)
Finite-Lived Intangible Assets, Net 31,643 32,897
Indefinite-lived intangible assets: 245 254
Total intangible assets, Net $ 31,888 33,151
Distribution Agreements/Customer Relationships [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 8 years 7 months 6 days  
Finite-Lived Intangible Assets, Gross $ 17,924 18,237
Total amortizable intangible assets (7,864) (7,746)
Finite-Lived Intangible Assets, Net $ 10,060 10,491
Existing Technology [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 4 years 10 months 24 days  
Finite-Lived Intangible Assets, Gross $ 38,931 38,761
Total amortizable intangible assets (21,413) (20,674)
Finite-Lived Intangible Assets, Net $ 17,518 18,087
Trade Names and Patents [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 5 years 1 month 6 days  
Finite-Lived Intangible Assets, Gross $ 8,576 8,681
Total amortizable intangible assets (4,511) (4,362)
Finite-Lived Intangible Assets, Net $ 4,065 $ 4,319
[1] Weighted average life in years as of March 31, 2021.