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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (UNAUDITED) (USD $)
 3 Months Ended 6 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 2012
Net sales $ 934,841 $ 1,883,771 $ 1,948,580 $ 3,585,719
Cost of sales (679,197) (1,114,560) (1,432,645) (2,084,259)
Gross profit 255,644 769,211 515,935 1,501,460
Operating Expenses:        
Selling, general and administrative 366,357 405,968 709,160 738,094
Research and development 136,789 115,741 228,046 203,722
Total operating expenses 503,146 521,709 937,206 941,816
(Loss) income from operations (247,502) 247,502 (421,271) 559,644
Other Income (Expense):        
Dividend and interest income 4,145 1,127 10,199 2,243
Interest expense          (308)
Total other income 4,145 1,127 10,199 1,935
(Loss) income before income tax (243,357) 248,629 (411,072) 561,579
Provision for income taxes    (11,710)    (33,029)
Net (loss) income (243,357) 236,919 (411,072) 528,550
Basic net (loss) income per common share (in Dollars per share) $ (0.03) $ 0.03 $ (0.06) $ 0.08
Diluted net (loss) income per common share (in Dollars per share) $ (0.03) $ 0.03 $ (0.06) $ 0.07
Weighted average number of common and common equivalent shares:        
Basic (in Shares) 7,278,967 6,966,185 7,277,659 6,959,224
Diluted (in Shares) 7,278,967 7,385,139 7,277,659 7,282,202
Net (loss) income (243,357) 236,919 (411,072) 528,550
Other comprehensive loss, net of tax:        
Foreign currency translation 77 (473) (14) (554)
Comprehensive (loss) income $ (243,280) $ 236,446 $ (411,086) $ 527,996