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Note 6 - Product Warranties (Tables)
12 Months Ended
Oct. 31, 2020
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

Years ended October 31,

 
  

2020

  

2019

 

Balance at beginning of year

 $120,000  $180,000 

Liabilities accrued for warranties issued during the year

  140,847   161,815 

Warranty claims paid during the period

  (102,150)  (218,426)

Changes in liability for pre-existing warranties during the year

  (73,697)  (3,389)

Balance at end of year

 $85,000  $120,000