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Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Gross $ 68,358 $ 67,023
Total amortizable intangible assets (34,287) (29,753)
Finite-Lived Intangible Assets, Net 34,071 37,270
Indefinite-lived intangible assets: 244 1,135
Total intangible assets, Net $ 34,315 38,405
Distribution Agreements/Customer Relationships [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 9 years 1 month 6 days  
Finite-Lived Intangible Assets, Gross $ 18,130 17,891
Total amortizable intangible assets (7,400) (6,340)
Finite-Lived Intangible Assets, Net $ 10,730 11,551
Existing Technology [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 5 years 4 months 24 days  
Finite-Lived Intangible Assets, Gross $ 41,347 41,222
Total amortizable intangible assets (22,524) (19,698)
Finite-Lived Intangible Assets, Net $ 18,823 21,524
Trade Names [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 5 years 8 months 12 days  
Finite-Lived Intangible Assets, Gross $ 8,668 7,692
Total amortizable intangible assets (4,150) (3,497)
Finite-Lived Intangible Assets, Net 4,518 4,195
Patents [Member]    
Finite-Lived Intangible Assets, Gross 213 218
Total amortizable intangible assets (213) (218)
Finite-Lived Intangible Assets, Net $ 0 $ 0
[1] Weighted average life as of September 30, 2020.