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Note 6 - Product Warranties (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

September 30,

 
  

2020

  

2019

 

Balance at beginning of year

 $1,438  $1,380 

Provision

  925   1,350 

Claims

  (965)  (1,254

)

Balance at end of period

 $1,398  $1,476