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Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Amortization of Intangible Assets, Total       $ 5,746 $ 5,384
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 5,500     5,500  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 5,500     5,500  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 5,500     5,500  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 5,300     5,300  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 5,300     $ 5,300  
Impairment of Intangible Assets (Excluding Goodwill), Total   $ 500     $ 0
In Process Research and Development Intangible Assets Reclassified as Completed Technology     $ 400    
Fully Amortized Intangible Assets, Retired $ 5,300        
In Process Research and Development [Member]          
Impairment of Intangible Assets (Excluding Goodwill), Total     $ 900