Note 6 - Product Warranty (Tables)

9 Months Ended

Aug. 31, 2014

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

	For the three months ended
	August 31, 2014			August 31, 2013
Balance, beginning	$	229,400		$	526,981
Settlements made in cash or in-kind		(70,683	)		(177,000	)
Warranties issued		126,379			170,447
Balance, ending	$	285,096		$	520,428

	For the nine months ended
	August 31, 2014			August 31, 2013
Balance, beginning	$	220,719		$	578,864
Settlements made in cash or in-kind		(265,753	)		(558,063	)
Warranties issued		330,130			499,627
Balance, ending	$	285,096		$	520,428