Condensed Consolidated Statements of Income (Unaudited, USD $)	3 Months Ended		9 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
Unaudited
Sales, net	$ 8,008,836	$ 4,979,343	$ 19,363,292	$ 13,781,168
Cost of goods sold	5,887,732	3,636,424	13,861,085	10,259,685
Gross profit	2,121,104	1,342,919	5,502,207	3,521,483
Selling, general and administrative expenses	1,366,731	946,168	3,581,053	2,702,976
Operating income	754,373	396,751	1,921,154	818,507
Other income, net	14,840	25,349	53,917	86,206
Income before provision for income taxes	769,213	422,100	1,975,071	904,713
Provision for income taxes	255,000	36,000	639,000	211,000
Net income	$ 514,213	$ 386,100	$ 1,336,071	$ 693,713
Basic and diluted earnings per common share	$ 0.16	$ 0.12	$ 0.41	$ 0.21