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Note 11 - Revenue - Product Revenue by Product Group (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue $ 35,397 $ 24,723
Joint Pain Management Therapies [Member]    
Revenue 25,483 22,850
Orthopedic Joint Preservation and Restoration Care [Member]    
Revenue 7,896 163
Manufactured Product, Other [Member]    
Revenue 2,018 1,704
Product [Member]    
Revenue $ 35,397 $ 24,717