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Note 12 - Revenue by Product Group, by Significant Customer and by Geographic Location; Geographic Information (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Years Ended December 31,
    2019   2018   2017
    Revenue   Percentage of
Product
Revenue
  Revenue   Percentage of
Product
Revenue
  Revenue   Percentage of
Product
Revenue
Orthobiologics     $
101,002
     
88
%   $
93,556
     
89
%   $
93,816
     
87
%
Surgical      
5,183
     
5
%    
5,514
     
5
%    
5,262
     
5
%
Dermal      
2,244
     
2
%    
396
     
0
%    
2,755
     
3
%
Other      
6,083
     
5
%    
6,065
     
6
%    
5,950
     
5
%
      $
114,512
     
100
%   $
105,531
     
100
%   $
107,783
     
100
%
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Years Ended December 31,
    2019   2018   2017
    Total   Percentage of   Total   Percentage of   Total   Percentage of
    Revenue   Revenue   Revenue   Revenue   Revenue   Revenue
Geographic Location:                                                
United States   $
90,302
     
79
%   $
85,351
     
81
%   $
92,905
     
82
%
Europe    
14,744
     
13
%    
11,730
     
11
%    
12,435
     
11
%
Other    
9,564
     
8
%    
8,474
     
8
%    
8,080
     
7
%
Total   $
114,610
     
100
%   $
105,555
     
100
%   $
113,420
     
100
%
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
    Years Ended December 31,
    2019   2018
United States   $
48,635
    $
51,385
 
Italy    
2,148
     
2,726
 
Total   $
50,783
    $
54,111