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Note 5 - Product Warranties (Tables)
6 Months Ended
Apr. 30, 2015
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Six Months Ended
 
 
 
April 30,
 
 
 
2015
 
 
2014
 
Balance at beginning of period
  $ 100,000     $ 190,000  
Liabilities accrued for warranties issued during the period
    185,083       212,255  
Warranty claims and costs paid during the period
    (106,415 )     (134,535 )
Changes in liability for pre-existing warranties during the period
    (28,668 )     (102,720 )
Balance at end of period
  $ 150,000     $ 165,000