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Statements of Operations (Unaudited) (USD $)
3 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Income Statement [Abstract]    
Sales, net $ 7,316,667 $ 4,572,702
Cost of goods sold 4,698,057 2,734,583
Gross profit 2,618,610 1,838,119
Selling, general and administrative expenses 1,722,673 1,285,901
Operating income 895,937 552,218
Other income, net 6,880 35,899
Income before provision for income taxes 902,817 588,117
Provision for income taxes 295,000 180,000
Net income $ 607,817 $ 408,117
Basic and diluted earnings per common share $ 0.18 $ 0.13