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Note 5 - Product Warranties (Tables)
6 Months Ended
Apr. 30, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Six Months Ended
 
 
 
April 30,
 
 
 
2016
 
 
2015
 
Balance at beginning of period
  $ 130,000     $ 100,000  
Liabilities accrued for warranties issued during the period
    80,506       185,083  
Warranty claims and costs paid during the period
    (78,682 )     (106,415 )
Changes in liability for pre-existing warranties during the period
    (56,824 )     (28,668 )
Balance at end of period
  $ 75,000     $ 150,000