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Note 6 - Product Warranty (Details) - Changes In Product Warranty Liability (USD $)
3 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Changes In Product Warranty Liability [Abstract]    
Balance, beginning $ 220,719 $ 578,864
Balance, ending 153,455 575,330
Settlements made in cash or in-kind (151,577) (168,689)
Warranties issued $ 84,313 $ 165,155