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Note 6 - Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
  

Gross Carrying

  

Accumulated

  

Net Carrying

 
  

Amount

  

Amortization

  

Value

 

Customer relationships:

            

Balance as of December 31, 2021

 $982  $(982) $ 

Balance as of December 31, 2020

  982   (911)  71