CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (UNAUDITED) (USD $)	3 Months Ended		9 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
Net sales	$ 1,514,673	$ 1,345,900	$ 4,538,944	$ 3,684,454
Cost of sales	(947,830)	(846,421)	(2,788,276)	(2,495,650)
Gross profit	566,843	499,479	1,750,668	1,188,804
Operating Expenses:
Selling, general and administrative	337,580	329,456	1,038,930	990,654
Research and development	94,770	97,008	266,258	314,980
Total Operating Expenses	432,350	426,464	1,305,188	1,305,634
Income (loss) from operations	134,493	73,015	445,480	(116,830)
Other Income (Expense):
Gain on insurance proceeds	68,106	0	68,106	0
Dividend and interest income	4,591	1,733	7,370	5,685
Interest expense	(171)	(1,345)	(1,113)	(5,106)
Other income, net	0	0	60	177,605
Total Other Income (Expense)	72,526	388	74,423	178,184
Income before income tax	207,019	73,403	519,903	61,354
Income tax expense	(25,574)	0	(25,574)	0
Net income	181,445	73,403	494,329	61,354
Basic net income per common share	$ 0.03	$ 0.01	$ 0.07	$ 0.01
Diluted net income per common share	$ 0.03	$ 0.01	$ 0.07	$ 0.01
Weighted average number of common and Common Equivalent Shares:
Basic	6,877,954	6,660,839	6,871,532	6,660,839
Diluted	7,125,560	6,691,475	7,046,458	6,694,375
Net income	181,445	73,403	494,329	61,354
Other comprehensive income (loss), net of tax:
Foreign currency translation	95	(308)	(1,528)	(1,013)
Comprehensive income	$ 181,540	$ 73,095	$ 492,801	$ 60,341