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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (UNAUDITED) (USD $)
 3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Net sales $ 1,492,719 $ 1,416,698 $ 3,441,299 $ 5,002,418
Cost of sales (914,157) (971,316) (2,346,803) (3,055,575)
Gross profit 578,562 445,382 1,094,496 1,946,843
Operating Expenses:        
Selling, general and administrative 405,768 358,533 1,114,872 1,096,627
Research and development 140,177 150,182 368,222 353,904
Total operating expenses 545,945 508,715 1,483,094 1,450,531
(Loss) income from operations 32,617 (63,333) (388,598) 496,312
Other Income (Expense):        
Dividend and interest income 3,482 7,073 13,681 9,316
Interest (expense) income (20) 6 (80) (302)
Total other income 3,462 7,079 13,601 9,014
(Loss) income before income tax 36,079 (56,254) (374,997) 505,326
(Provision) benefit for income taxes (9,535) 20,640 (9,535) (12,389)
Net (loss) income 26,544 (35,614) (384,532) 492,937
Basic net (loss) income per common share (in Dollars per share) $ 0.00 $ (0.01) $ (0.05) $ 0.07
Diluted net (loss) income per common share (in Dollars per share) $ 0.00 $ (0.01) $ (0.05) $ 0.07
Weighted average number of common and common equivalent shares:        
Basic (in Shares) 7,378,403 7,000,011 7,310,872 6,972,671
Diluted (in Shares) 7,731,252 7,000,011 7,310,872 7,410,917
Net (loss) income 26,544 (35,614) (384,532) 492,937
Other comprehensive loss, net of tax:        
Foreign currency translation (1,110) (2,155) (1,114) (2,709)
Comprehensive (loss) income $ 25,434 $ (37,769) $ (385,646) $ 490,228