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Note 5 - Product Warranties (Tables)
9 Months Ended
Jul. 31, 2020
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

Nine Months Ended

 
  

July 31

 
  

2020

  

2019

 

Balance at beginning of period

 $120,000  $180,000 

Liabilities accrued for warranties issued during the period

  141,033   222,520 

Warranty claims and costs paid during the period

  (65,736)  (205,629)

Changes in liability for pre-existing warranties during the period

  (85,297)  3,109 

Balance at end of period

 $110,000  $200,000