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

June 30,

 
  

2020

  

2019

 

Balance at beginning of year

 $1,438  $1,380 

Provision

  528   948 

Claims

  (628

)

  (822

)

Balance at end of period

 $1,338  $1,506