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Note 5 - Product Warranties (Tables)
6 Months Ended
Apr. 30, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

Six Months Ended

 
   

April 30,

 
   

2019

   

2018

 

Balance at beginning of period

  $ 180,000     $ 180,000  

Liabilities accrued for warranties issued during the period

    153,981       179,494  

Warranty claims and costs paid during the period

    (176,554 )     (119,181 )

Changes in liability for pre-existing warranties during the period

    2,573       (45,313 )

Balance at end of period

  $ 160,000     $ 195,000