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Note 11 - Convertible Senior Notes (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
  

December 31, 2020

 

Face amount of convertible senior notes

 $33,839 

Discount

  (9,453)

Net carrying value

 $24,386 

Carrying amount of equity component included in paid-in capital

 $108,714 

Excess of instruments’ if-converted values over face principal amounts

 $