XML 47 R29.htm IDEA: XBRL DOCUMENT v3.10.0.1
Note 6 - Product Warranties (Tables)
12 Months Ended
Oct. 31, 2018
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Years ended October 31,
 
   
2018
   
2017
 
Balance at beginning of year
  $
180,000
    $
70,000
 
Liabilities accrued for warranties issued during the year
   
266,258
     
238,093
 
Warranty claims paid during the period
   
(219,190
)    
(171,523
)
Changes in liability for pre-existing warranties during the year
   
(47,068
)    
43,430
 
Balance at end of year
  $
180,000
    $
180,000