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Note 10 - Warranty (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

 

Beginning balance

 $154,000  $277,000 

Warranties originated during the year

  65,000   71,000 

Claims settled made during the year

  (149,000)  (212,000)

Changes in reserve estimate

  (3,000)  18,000 

Ending balance

 $67,000  $154,000