Note 5 - Product Warranties (Tables)
 3 Months Ended
Jan. 31, 2015
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Three Months Ended
 
 
 
January 31,
 
 
 
2015
 
 
2014
 
Balance at beginning of period
   $ 100,000     $ 190,000  
Liabilities accrued for warranties issued during the period
     86,639       104,777  
Warranty claims and costs paid during the period
     (34,079 )     (50,539 )
Changes in liability for pre-existing warranties during the period
     (47,560 )     (84,238 )
Balance at end of period
   $ 105,000     $ 160,000