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Note 3 - Revenue (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Three Months Ended September 30,   Nine Months Ended September 30,
    2019   2018   2019   2018
Orthobiologics   $
26,765
     $
24,097
     $
74,975
     $
69,778
  
Surgical    
578
      
1,191
      
4,071
      
3,700
  
Dermal    
417
      
80
      
990
      
163
  
Other    
1,855
      
1,413
      
4,709
      
4,940
  
Product Revenue   $
29,615
     $
26,781
     $
84,745
     $
78,581
  
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Three Months Ended September 30,
    2019   2018
    Total   Percentage of   Total   Percentage of
    Revenue   Revenue   Revenue   Revenue
Geographic Location:                                
United States   $
23,512
      
79
 %   $
21,695
      
81
 %
Europe    
3,943
      
13
 %    
3,132
      
12
 %
Other    
2,242
      
8
 %    
1,960
      
7
 %
Total Revenue   $
29,697
      
100
 %   $
26,787
      
100
 %
    Nine Months Ended September 30,
    2019   2018
    Total   Percentage of   Total   Percentage of
    Revenue   Revenue   Revenue   Revenue
Geographic Location:                                
United States   $
66,538
      
78
 %   $
63,377
      
81
 %
Europe    
11,396
      
14
 %    
9,021
      
11
 %
Other    
6,904
      
8
 %    
6,201
      
8
 %
Total Revenue   $
84,838
      
100
 %   $
78,599
      
100
 %