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Note 6 - Product Warranties (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

September 30,

 
   

2021

   

2020

 

Balance at beginning of year

  $ 1,361     $ 1,438  

Provision

    1,317       925  

Claims

    (1,248 )     (965

)

Balance at end of period

  $ 1,430     $ 1,398