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Note 5 - Product Warranties (Tables)
9 Months Ended
Jul. 31, 2021
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

Nine Months Ended

 
  

July 31,

 
  

2021

  

2020

 

Balance at beginning of period

 $85,000  $120,000 

Liabilities accrued for warranties issued during the period

  86,287   141,033 

Warranty claims and costs paid during the period

  (50,714)  (65,736)

Changes in liability for pre-existing warranties during the period

  (25,573)  (85,297)

Balance at end of period

 $95,000  $110,000