CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (UNAUDITED) (USD $)	3 Months Ended		6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Net sales	$ 1,883,771	$ 1,616,606	$ 3,585,719	$ 3,024,271
Cost of sales	(1,114,560)	(949,202)	(2,084,259)	(1,840,446)
Gross profit	769,211	667,404	1,501,460	1,183,825
Operating Expenses:
Selling, general and administrative	405,968	387,767	738,094	701,351
Research and development	115,741	85,551	203,722	171,487
Total operating expenses	521,709	473,318	941,816	872,838
Income from operations	247,502	194,086	559,644	310,987
Other Income (Expense):
Dividend and interest income	1,127	1,316	2,243	2,780
Interest expense		(370)	(308)	(943)
Other Income		60		60
Total other income	1,127	1,006	1,935	1,897
Income before income tax	248,629	195,092	561,579	312,884
Provision for income taxes	(11,710)		(33,029)
Net income	236,919	195,092	528,550	312,884
Basic net income per common share (in Dollars per share)	$ 0.03	$ 0.03	$ 0.08	$ 0.05
Diluted net income per common share (in Dollars per share)	$ 0.03	$ 0.03	$ 0.07	$ 0.05
Weighted average number of common and common equivalent shares:
Basic (in Shares)	6,966,185	6,868,339	6,959,224	6,868,339
Diluted (in Shares)	7,385,139	6,920,296	7,282,202	6,908,380
Net income	236,919	195,092	528,550	312,884
Other comprehensive loss, net of tax:
Foreign currency translation	(473)	(1,183)	(554)	(1,623)
Comprehensive income	$ 236,446	$ 193,909	$ 527,996	$ 311,261