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Note 6 - Product Warranties (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

March 31,

 
  

2021

  

2020

 

Balance at beginning of year

 $1,361  $1,438 

Provision

  510   294 

Claims

  (395)  (302

)

Balance at end of period

 $1,476  $1,430