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Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Total amortizable intangible assets $ (30,750) $ (29,753)
Indefinite-lived tradename 232 1,135
Total Intangible Assets, Gross 67,557 68,158
Intangible assets, net $ 36,807 38,405
Distribution Agreements/Customer Relationships [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 8 years 146 days  
Finite-Lived Intangible Assets, Gross $ 17,685 17,891
Total amortizable intangible assets (6,550) (6,340)
Finite-Lived Intangible Assets, Net $ 11,135 11,551
Existing Technology [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 5 years 182 days  
Finite-Lived Intangible Assets, Gross $ 40,923 41,222
Total amortizable intangible assets (20,327) (19,698)
Finite-Lived Intangible Assets, Net $ 20,596 21,524
Trade Names [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 5 years 109 days  
Finite-Lived Intangible Assets, Gross $ 8,511 7,692
Total amortizable intangible assets (3,667) (3,497)
Finite-Lived Intangible Assets, Net 4,844 4,195
Patents [Member]    
Finite-Lived Intangible Assets, Gross 206 218
Total amortizable intangible assets (206) (218)
Finite-Lived Intangible Assets, Net
[1] Weighted average life as of March 31, 2020.