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Note 9 - Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

Three-month period ended March 31,

 
  

2022

  

2021

 

Accrued warranty obligations – beginning

 $133  $149 

Accruals for warranties issued

  18   45 

Settlements made

  (31)  (23)

Accrued warranty obligations – ending

 $120  $171