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Note 5 - Product Warranties (Tables)
9 Months Ended
Jul. 31, 2015
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Nine Months Ended
 
 
 
July 31,
 
 
 
2015
 
 
2014
 
Balance at beginning of period
  $ 100,000     $ 190,000  
Liabilities accrued for warranties issued during the period
    205,376       299,477  
Warranty claims and costs paid during the period
    (134,643 )     (250,965 )
Changes in liability for pre-existing warranties during the period
    24,267       (103,512 )
Balance at end of period
  $ 195,000     $ 135,000