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Note 8 - Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
  

September 30, 2022

  

December 31, 2021

 

Patents and copyrights

 $14,518  $14,755 

Accumulated amortization

  (13,028)  (12,970)
  $1,490  $1,785