CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $)	12 Months Ended
	May 31, 2013	May 31, 2012
Net sales	$ 6,472,960	$ 6,081,131
Cost of sales	(4,045,099)	(3,783,955)
GROSS PROFIT	2,427,861	2,297,176
OPERATING EXPENSES
Selling, general and administrative	1,454,767	1,445,049
Research and development	459,086	347,128
Total operating expenses	1,913,853	1,792,177
INCOME FROM OPERATIONS	514,008	504,999
OTHER INCOME (EXPENSE)
Interest expense	(302)	(1,585)
Interest and dividend income	10,708	8,347
Other income	50	101,688
Total other income	10,456	108,450
INCOME BEFORE INCOME TAXES	524,464	613,449
INCOME TAX BENEFIT (EXPENSE)	12,493	(65,014)
NET INCOME	536,957	548,435
BASIC NET INCOME PER COMMON SHARE (in Dollars per share)	$ 0.08	$ 0.08
DILUTED NET INCOME PER COMMON SHARE (in Dollars per share)	$ 0.07	$ 0.08
WEIGHTED AVERAGE NUMBER OF COMMON AND COMMON EQUIVALENT SHARES
Basic (in Shares)	7,024,418	6,887,929
Diluted (in Shares)	7,451,113	7,107,759
NET INCOME	536,957	548,435
OTHER COMPREHENSIVE LOSS
Foreign currency translation	(2,976)	(1,570)
COMPREHENSIVE INCOME	$ 533,981	$ 546,865