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Note 15 - Segment and Geographic Information (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Three Months Ended March 31,
    2017   2016
Orthobiologics   $
20,227
     $
19,587
  
Surgical    
1,296
      
1,318
  
Dermal    
425
      
381
  
Other    
1,433
      
992
  
   Product Revenue   $
23,381
     $
22,278
  
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Three Months Ended March 31,
    2017   2016
    Total   Percentage of   Total   Percentage of
    Revenue   Revenue   Revenue   Revenue
Geographic Location:                                
United States   $
18,930
      
81
 %   $
18,011
      
81
 %
Europe    
2,829
      
12
 %    
2,565
      
11
 %
Other    
1,627
      
7
 %    
1,707
      
8
 %
Total Revenue   $
23,386
      
100
 %   $
22,283
      
100
 %