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Note 5 - Product Warranties (Tables)
9 Months Ended
Jul. 31, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

Nine Months Ended

 
   

July 31,

 
   

2019

   

2018

 

Balance at beginning of period

  $ 180,000     $ 180,000  

Liabilities accrued for warranties issued during the period

    222,520       165,269  

Warranty claims and costs paid during the period

    (205,629 )     (157,377 )

Changes in liability for pre-existing warranties during the period

    3,109       (22,892 )

Balance at end of period

  $ 200,000     $ 165,000