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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 12 Months Ended
May. 31, 2015
May. 31, 2014
Net sales $ 4,962,373 $ 5,120,451
Cost of sales (3,420,567) (3,451,243)
GROSS PROFIT 1,541,806 1,669,208
OPERATING EXPENSES    
Selling, general and administrative 1,478,761 1,525,936
Research and development 733,640 589,866
Total operating expenses 2,212,401 2,115,802
LOSS FROM OPERATIONS $ (670,595) (446,594)
OTHER INCOME (EXPENSE)    
Interest expense   (142)
Interest and dividend income $ 21,906 17,183
Other income 2,255 3,133
Total other income 24,161 20,174
LOSS BEFORE INCOME TAXES (646,434) (426,420)
INCOME TAX BENEFIT 315,024 210,760
NET LOSS $ (331,410) $ (215,660)
BASIC NET LOSS PER COMMON SHARE (in Dollars per share) $ (0.04) $ (0.03)
DILUTED NET LOSS PER COMMON SHARE (in Dollars per share) $ (0.04) $ (0.03)
WEIGHTED AVERAGE NUMBER OF COMMON AND COMMON EQUIVALENT SHARES    
Basic (in Shares) 7,552,262 7,370,787
Diluted (in Shares) 7,552,262 7,370,787
NET LOSS $ (331,410) $ (215,660)
OTHER COMPREHENSIVE LOSS    
Foreign currency translation (2,115) (1,143)
COMPREHENSIVE LOSS $ (333,525) $ (216,803)