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Note 3 - Revenue (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Three Months Ended March 31,
    2018   2017
Orthobiologics   $
19,489
     $
20,227
  
Surgical    
1,245
      
1,296
  
Dermal    
(539
 )    
425
  
Other    
1,063
      
1,433
  
Product Revenue   $
21,258
     $
23,381
  
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Three Months Ended March 31,
    2018   2017
 
 		  
 		 Total
Revenue		  
 		 Percentage of
Revenue		  
 		 Total
Revenue		  
 		 Percentage of
Revenue
Geographic Location:                                
United States   $
16,910
      
80
 %   $
18,930
      
81
 %
Europe    
2,391
      
11
 %    
2,829
      
12
 %
Other    
1,963
      
9
 %    
1,627
      
7
 %
Total Revenue   $
21,264
      
100
 %   $
23,386
      
100
 %