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Note 16 - Segment and Geographic Information (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Three Months Ended September 30,   Nine Months Ended September 30,
    2017   2016   2017   2016
Orthobiologics   $
23,990
     $
22,428
     $
68,686
     $
65,319
  
Surgical    
1,765
      
1,173
      
4,395
      
3,924
  
Dermal    
358
      
594
      
1,235
      
1,558
  
Other    
1,065
      
1,588
      
4,583
      
3,835
  
Product Revenue   $
27,178
     $
25,783
     $
78,899
     $
74,636
  
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Three Months Ended September 30,
    2017   2016
    Total
Revenue		   Percentage of
Revenue		   Total
Revenue		   Percentage of
Revenue
Geographic Location:                                
United States   $
22,227
      
82
 %   $
21,126
      
82
 %
Europe    
2,832
      
10
 %    
2,703
      
10
 %
Other    
2,125
      
8
 %    
1,960
      
8
 %
Total Revenue   $
27,184
      
100
 %   $
25,789
      
100
 %
    Nine Months Ended September 30,
    2017   2016
    Total
Revenue		   Percentage of
Revenue		   Total
Revenue		   Percentage of
Revenue
Geographic Location:                                
United States   $
68,624
      
82
 %   $
61,032
      
82
 %
Europe    
9,743
      
11
 %    
8,240
      
11
 %
Other    
5,665
      
7
 %    
5,381
      
7
 %
Total Revenue   $
84,032
      
100
 %   $
74,653
      
100
 %