CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	12 Months Ended
	May 31, 2016	May 31, 2015
Net sales	$ 5,139,816	$ 4,962,373
Cost of sales	(3,615,774)	(3,420,567)
GROSS PROFIT	1,524,042	1,541,806
OPERATING EXPENSES
Selling, general and administrative	1,570,661	1,478,761
Research and development	780,333	733,640
Total operating expenses	2,350,994	2,212,401
LOSS FROM OPERATIONS	(826,952)	(670,595)
OTHER INCOME (EXPENSE)
Interest expense	(167)
Interest and dividend income	24,123	21,906
Other income	7,009	2,255
Total other income	30,965	24,161
LOSS BEFORE INCOME TAXES	(795,987)	(646,434)
INCOME TAX (EXPENSE) BENEFIT	(703,800)	315,024
NET LOSS	$ (1,499,787)	$ (331,410)
BASIC NET LOSS PER COMMON SHARE (in Dollars per share)	$ (0.20)	$ (0.04)
DILUTED NET LOSS PER COMMON SHARE (in Dollars per share)	$ (0.20)	$ (0.04)
WEIGHTED AVERAGE NUMBER OF COMMON AND COMMON EQUIVALENT SHARES
Basic (in Shares)	7,626,078	7,552,262
Diluted (in Shares)	7,626,078	7,552,262
NET LOSS	$ (1,499,787)	$ (331,410)
OTHER COMPREHENSIVE LOSS
Foreign currency translation	(1,322)	(2,115)
COMPREHENSIVE LOSS	$ (1,501,109)	$ (333,525)