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Note 3 - Revenue - Product Revenue by Product Group (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue $ 21,264 $ 23,386
Orthobiologics [Member]    
Revenue 19,489 20,227
Surgical [Member]    
Revenue 1,245 1,296
Dermal [Member]    
Revenue   425
Revenue (539)  
Manufactured Product, Other [Member]    
Revenue 1,063 1,433
Product [Member]    
Revenue $ 21,258 $ 23,381