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Note 6 - Product Warranties (Tables)
12 Months Ended
Oct. 31, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Years ended October 31,
 
 
 
2016
 
 
2015
 
Balance at beginning of year
  $
130,000
    $
100,000
 
Liabilities accrued for warranties issued during the year
   
124,018
     
215,802
 
Warranty claims paid during the period
   
(130,691
)    
(204,784
)
Changes in liability for pre-existing warranties during the year
   
(53,327
)    
18,982
 
                 
Balance at end of year
  $
70,000
    $
130,000