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Note 6 - Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Gross $ 67,023 $ 73,351
Total amortizable intangible assets (29,753) (28,819)
Finite-Lived Intangible Assets, Net 37,270 44,532
Indefinite-lived intangible assets: 1,135 1,232
Intangible assets, net $ 38,405 45,764
Distribution Agreements/Customer Relationships [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 9 years 292 days  
Finite-Lived Intangible Assets, Gross $ 17,891 22,657
Total amortizable intangible assets (6,340) (9,509)
Finite-Lived Intangible Assets, Net $ 11,551 13,148
Existing Technology [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 6 years 36 days  
Finite-Lived Intangible Assets, Gross $ 41,222 41,268
Total amortizable intangible assets (19,698) (16,215)
Finite-Lived Intangible Assets, Net $ 21,524 25,053
Trade Names [Member]    
Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) [1] 6 years 292 days  
Finite-Lived Intangible Assets, Gross $ 7,692 7,828
Total amortizable intangible assets (3,497) (2,861)
Finite-Lived Intangible Assets, Net 4,195 4,967
In Process Research and Development [Member]    
Finite-Lived Intangible Assets, Gross 1,387
Total amortizable intangible assets (30)
Finite-Lived Intangible Assets, Net 1,357
Patents [Member]    
Finite-Lived Intangible Assets, Gross 218 211
Total amortizable intangible assets (218) (204)
Finite-Lived Intangible Assets, Net $ 7
[1] Weighted average life as of December 31, 2019.