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Note 5 - Product Warranties (Tables)
9 Months Ended
Jul. 31, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Nine Months Ended
 
 
 
July 31,
 
 
 
2016
 
 
2015
 
Balance at beginning of period
  $ 130,000     $ 100,000  
Liabilities accrued for warranties issued during the period
    117,437       205,376  
Warranty claims and costs paid during the period
    (112,724 )     (134,643 )
Changes in liability for pre-existing warranties during the period
    (59,713 )     24,267  
Balance at end of period
  $ 75,000     $ 195,000