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Note 15 - Product Revenue by Product Group (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Orthobiologics [Member]    
Product revenue $ 19,587 $ 11,973
Surgical [Member]    
Product revenue 1,318 1,390
Dermal [Member]    
Product revenue 381 416
Other [Member]    
Product revenue 992 1,736
Product revenue $ 22,278 $ 15,515