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Note 3 - Revenue (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Three Months Ended March 31,
    2019   2018
Orthobiologics   $
21,748
     $
19,489
  
Surgical    
1,392
      
1,245
  
Dermal    
129
      
(539
 )
Other    
1,448
      
1,063
  
Product Revenue   $
24,717
     $
21,258
  
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Three Months Ended March 31,
    2019   2018
    Total
Revenue		   Percentage of
Revenue		   Total
Revenue		   Percentage of
Revenue
Geographic Location:                                
United States   $
20,089
      
81
 %   $
16,910
      
80
 %
Europe    
2,526
      
10
 %    
2,391
      
11
 %
Other    
2,108
      
9
 %    
1,963
      
9
 %
Total Revenue   $
24,723
      
100
 %   $
21,264
      
100
 %