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Note 5 - Product Warranties (Tables)
3 Months Ended
Jan. 31, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Three Months Ended
 
 
 
January 31,
 
 
 
2016
 
 
2015
 
Balance at beginning of period
  $ 130,000     $ 100,000  
Liabilities accrued for warranties issued during the period
    73,968       86,639  
Warranty claims and costs paid during the period
    (52,730 )     (34,079 )
Changes in liability for pre-existing warranties during the period
    (61,238 )     (47,560 )
Balance at end of period
  $ 90,000     $ 105,000