Note 6 - Product Warranty (Tables)

3 Months Ended

Aug. 31, 2013

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

	For the three months ended
	August 31, 2013			August 31, 2012
Balance, beginning	$	526,981		$	277,965
Settlements made in cash or in-kind		(177,000	)		(94,065	)
Warranties issued		170,447			313,898
Balance, ending	$	520,428		$	497,798

	For the nine months ended
	August 31, 2013			August 31, 2012
Balance, beginning	$	578,864		$	201,630
Settlements made in cash or in-kind		(558,063	)		(270,784	)
Warranties issued		499,627			566,952
Balance, ending	$	520,428		$	497,798