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Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Gross $ 67,653 $ 67,023
Total amortizable intangible assets (32,393) (29,753)
Finite-Lived Intangible Assets, Net 35,260 37,270
Indefinite-lived intangible assets, Net 235 1,135
Intangible assets, net $ 35,495 38,405
Distribution Agreements/Customer Relationships [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 9 years 3 months 18 days  
Finite-Lived Intangible Assets, Gross $ 17,886 17,891
Total amortizable intangible assets (6,987) (6,340)
Finite-Lived Intangible Assets, Net $ 10,899 11,551
Existing Technology [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 5 years 8 months 12 days  
Finite-Lived Intangible Assets, Gross $ 40,976 41,222
Total amortizable intangible assets (21,277) (19,698)
Finite-Lived Intangible Assets, Net $ 19,699 21,524
Trade Names [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 5 years 10 months 24 days  
Finite-Lived Intangible Assets, Gross $ 8,586 7,692
Total amortizable intangible assets (3,924) (3,497)
Finite-Lived Intangible Assets, Net 4,662 4,195
Patents [Member]    
Finite-Lived Intangible Assets, Gross 205 218
Total amortizable intangible assets (205) (218)
Finite-Lived Intangible Assets, Net $ 0 $ 0
[1] Weighted average life as of June 30, 2020.