CONDENSED CONSOLIDATED STATEMENTS OF OPERATION (USD $)	3 Months Ended		6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2011	Nov. 30, 2010
Net sales	$ 1,616,606	$ 1,160,842	$ 3,024,271	$ 2,338,554
Cost of sales	949,202	860,297	1,840,446	1,649,229
Gross profit	667,404	300,545	1,183,825	689,325
Operating Expenses:
Selling, general and administrative	387,767	358,040	701,351	661,198
Research and development	85,551	120,120	171,487	217,972
Total Operating Expenses	473,318	478,160	872,838	879,170
Income (loss) from operations	194,086	(177,615)	310,987	(189,845)
Other Income (Expense):
Interest income	1,316	1,809	2,780	3,952
Interest expense	(370)	(1,625)	(943)	(3,761)
Other income	60	177,568	60	177,605
Total Other Income (Expense)	1,006	177,752	1,897	177,796
Net income (loss)	195,092	137	312,884	(12,049)
Basic net income (loss) per common share	$ 0.03	$ 0.00	$ 0.05	$ 0.00
Diluted net income (loss) per common share	$ 0.03	$ 0.00	$ 0.05	$ 0.00
Weighted average number of common and Common Equivalent Shares:
Basic	6,868,339	6,660,839	6,868,339	6,660,839
Diluted	6,920,296	6,660,839	6,908,380	6,660,839
Net income (loss)	195,092	137	312,884	(12,049)
Other comprehensive loss, net of tax:
Foreign currency translation	(1,183)	(139)	(1,623)	(705)
Comprehensive income (loss)	$ 193,909	$ (2)	$ 311,261	$ (12,754)