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Note 5 - Warranty and Extended Service Contract (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Beginning Balance

 $3,155  $4,832  $4,401  $4,668 

Add: Accruals for warranties issued during the period

  1,274   1,504   3,234   5,656 

Less: Settlements made during the period

  (1,505)  (1,930)  (4,711)  (5,918)

Ending Balance

 $2,924  $4,406  $2,924  $4,406