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Note 3 - Accounts Receivable, Net (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Accounts Receivable [Table Text Block]
   

December 31, 2022

   

December 31, 2021

 

Trade accounts receivable

  $ 27,600     $ 29,646  

Royalty revenue receivable

    12,750       2,880  

Total accounts receivable

  $ 40,350     $ 32,526