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Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

As of December 31,

 
  

2021

  

2020

 

Balance, beginning of period

 $33  $163 

Increase (reduction) of warranty reserve

  70   (78)

Warranty claims

  22   (52)

Balance, end of period

 $125  $33