CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (USD $)	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Net sales	$ 1,416,698	$ 1,514,673	$ 5,002,418	$ 4,538,944
Cost of sales	(971,316)	(947,830)	(3,055,575)	(2,788,276)
Gross profit	445,382	566,843	1,946,843	1,750,668
Operating Expenses:
Selling, general and administrative	358,533	337,580	1,096,627	1,038,930
Research and development	150,182	94,770	353,904	266,258
Total operating expenses	508,715	432,350	1,450,531	1,305,188
Income (loss) from operations	(63,333)	134,493	496,312	445,480
Other Income (Expense):
Gain on insurance		68,106		68,106
Dividend and interest income	7,073	4,591	9,316	7,370
Interest expense	6	(171)	(302)	(1,113)
Other income				60
Total other income	7,079	72,526	9,014	74,423
Income (loss) before income tax	(56,254)	207,019	505,326	519,903
(Provision) benefit for income taxes	20,640	(25,574)	(12,389)	(25,574)
Net income (loss)	(35,614)	181,445	492,937	494,329
Basic net income (loss) per common share (in Dollars per share)	$ (0.01)	$ 0.03	$ 0.07	$ 0.07
Diluted net income (loss) per common share (in Dollars per share)	$ (0.01)	$ 0.03	$ 0.07	$ 0.07
Weighted average number of common and common equivalent shares:
Basic (in Shares)	7,000,011	6,877,954	6,972,671	6,871,532
Diluted (in Shares)	7,000,011	7,125,560	7,410,917	7,046,458
Other comprehensive income (loss), net of tax:
Foreign currency translation	(2,155)	95	(2,709)	(1,528)
Comprehensive income (loss)	$ (37,769)	$ 181,540	$ 490,228	$ 492,801