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Note 3 - Revenue (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Three Months Ended June 30,   Six Months Ended June 30,
    2018   2017   2018   2017
Orthobiologics   $
26,192
     $
24,468
     $
45,681
     $
44,695
  
Surgical    
1,263
      
1,335
      
2,509
      
2,631
  
Dermal    
623
      
453
      
83
      
878
  
Other    
2,464
      
2,084
      
3,527
      
3,517
  
Product Revenue   $
30,542
     $
28,340
     $
51,800
     $
51,721
  
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Three Months Ended June 30,
    2018   2017
    Total
Revenue		   Percentage of
Revenue		   Total
Revenue		   Percentage of
Revenue
Geographic Location:                                
United States   $
24,773
      
81
 %   $
27,447
      
82
 %
Europe    
3,498
      
11
 %    
4,060
      
12
 %
Other    
2,277
      
8
 %    
1,955
      
6
 %
Total Revenue   $
30,548
      
100
 %   $
33,462
      
100
 %
    Six Months Ended June 30,
    2018   2017
    Total
Revenue		   Percentage of
Revenue		   Total
Revenue		   Percentage of
Revenue
Geographic Location:                                
United States   $
41,682
      
81
 %   $
46,377
      
82
 %
Europe    
5,889
      
11
 %    
6,889
      
12
 %
Other    
4,241
      
8
 %    
3,582
      
6
 %
Total Revenue   $
51,812
      
100
 %   $
56,848
      
100
 %