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Note 5 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]

Beginning balance, January 1, 2021

 $5,888 

Purchase price contingent consideration (1)

  68,013 

Changes in fair value

  55 

Payments

  (3,750)

Ending balance, September 30, 2021

 $70,206