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Note 6 - Product Warranties (Tables)
12 Months Ended
Oct. 31, 2015
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Years ended October 31,
 
 
 
2015
 
 
2014
 
Balance at beginning of year
  $ 100,000     $ 190,000  
Liabilities accrued for warranties issued during the year
    215,802       323,564  
Warranty claims paid during the period
    (204,784 )     (310,525 )
Changes in liability for pre-existing warranties during the year
    18,982       (103,039 )
Balance at end of year
  $ 130,000     $ 100,000