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Note 5 - Product Warranties (Tables)
Apr. 30, 2022
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

Six Months Ended

 
   

April 30,

 
   

2022

   

2021

 

Balance at beginning of period

  $ 75,000     $ 85,000  

Liabilities accrued for warranties issued during the period

    80,092       77,122  

Warranty claims and costs paid during the period

    (33,535 )     (46,271 )

Changes in liability for pre-existing warranties during the period

    (56,557 )     (20,851 )

Balance at end of period

  $ 65,000     $ 95,000