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

Three Months Ended

 
  

January 31,

 
  

2021

  

2020

 

Balance at beginning of period

 $85,000  $120,000 

Liabilities accrued for warranties issued during the period

  50,251   69,549 

Warranty claims and costs paid during the period

  (18,348)  (12,743)

Changes in liability for pre-existing warranties during the period

  (31,903)  (106,806)

Balance at end of period

 $85,000  $70,000