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Note 3 - Revenue (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Three Months Ended September 30,   Nine Months Ended September 30,
    2018   2017   2018   2017
Orthobiologics   $
24,097
     $
23,990
     $
69,778
     $
68,686
  
Surgical    
1,191
      
1,765
      
3,700
      
4,395
  
Dermal    
80
      
358
      
163
      
1,235
  
Other    
1,413
      
1,065
      
4,940
      
4,583
  
Product Revenue   $
26,781
     $
27,178
     $
78,581
     $
78,899
  
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Three Months Ended September 30,
    2018   2017
   
Total
Revenue
  
Percentage of
Revenue
  
Total
Revenue
  
Percentage of
Revenue
Geographic Location:                                
United States   $
21,695
      
81
 %   $
22,227
      
82
 %
Europe    
3,132
      
12
 %    
2,832
      
10
 %
Other    
1,960
      
7
 %    
2,125
      
8
 %
Total Revenue   $
26,787
      
100
 %   $
27,184
      
100
 %
    Nine Months Ended September 30,
    2018   2017
   
Total
Revenue
  
Percentage of
Revenue
  
Total
Revenue
  
Percentage of
Revenue
Geographic Location:                                
United States   $
63,377
      
81
 %   $
68,624
      
82
 %
Europe    
9,021
      
11
 %    
9,743
      
11
 %
Other    
6,201
      
8
 %    
5,665
      
7
 %
Total Revenue   $
78,599
      
100
 %   $
84,032
      
100
 %