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Note 11 - Revenue (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Three Months Ended March 31,
    2020   2019
         
Joint Pain Management   $
25,483
     $
22,850
  
Orthopedic Joint Preservation and Restoration    
7,896
      
163
  
Other    
2,018
      
1,704
  
    $
35,397
     $
24,717
  
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Three Months Ended March 31,
    2020   2019
    Total   Percentage of   Total   Percentage of
    Revenue   Revenue   Revenue   Revenue
Geographic Location:                                
United States   $
26,306
      
74
 %   $
20,089
      
81
 %
Europe    
5,276
      
15
 %    
2,526
      
10
 %
Other    
3,815
      
11
 %    
2,108
      
9
 %
Total   $
35,397
      
100
 %   $
24,723
      
100
 %