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Note 10 - Revenue (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Three Months Ended March 31,

 
   

2021

   

2020

 
                 

Joint Pain Management

  $ 19,316     $ 25,483  

Joint Preservation and Restoration

    12,219       7,896  

Other

    2,757       2,018  
    $ 34,292     $ 35,397  
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
   

Three Months Ended March 31,

 
   

2021

   

2020

 
           

Percentage of

           

Percentage of

 
   

Revenue

   

Revenue

   

Revenue

   

Revenue

 

Geographic Location:

                               

United States

  $ 25,005       73

%

  $ 26,306       74

%

Europe

    5,480       16

%

    5,276       15

%

Other

    3,807       11

%

    3,815       11

%

Total

  $ 34,292       100

%

  $ 35,397       100

%