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Note 11 - Revenue (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

Joint Pain Management

 $18,439  $27,581  $66,168  $77,063 

Orthopedic Joint Preservation and Restoration

  11,715   544   26,233   1,510 

Other

  1,540   1,490   5,368   6,172 
  $31,694  $29,615  $97,769  $84,745 
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
  

Three Months Ended September 30,

 
  

2020

  

2019

 
  

Total

  

Percentage of

  

Total

  

Percentage of

 
  

Revenue

  

Revenue

  

Revenue

  

Revenue

 

Geographic Location:

                

United States

 $26,409   84% $23,512   79%

Europe

  2,954   9%  3,943   13%

Other

  2,331   7%  2,242   8%

Total

 $31,694   100% $29,697   100%
  

Nine Months Ended September 30,

 
  

2020

  

2019

 
  

Total

  

Percentage of

  

Total

  

Percentage of

 
  

Revenue

  

Revenue

  

Revenue

  

Revenue

 

Geographic Location:

                

United States

 $77,848   80% $66,538   78%

Europe

  11,140   11%  11,396   14%

Other

  8,781   9%  6,904   8%

Total

 $97,769   100% $84,838   100%