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Note 5 - Product Warranties (Tables)
6 Months Ended
Apr. 30, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Six Months Ended
 
 
 
April 30,
 
 
 
2017
 
 
2016
 
Balance at beginning of period
  $
70,000
    $
130,000
 
Liabilities accrued for warranties issued during the period
   
101,824
     
80,506
 
Warranty claims and costs paid during the period
   
(56,638
)    
(78,682
)
Changes in liability for pre-existing warranties during the period
   
(20,186
)    
(56,824
)
Balance at end of period
  $
95,000
    $
75,000