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Earnings Per Share (Details 1) (USD $)
3 Months Ended 6 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
Numerator:        
Net income available to common stockholders: $ 2,603 $ 237,248 $ 834,608 $ 623,934
Denominator:        
Weighted-average shares outstanding: Basic 26,111,201 26,111,201 26,111,201 26,111,201
Weighted-average shares outstanding: Incremental shares from assumed conversion of options 1,336,364   1,130,769  
Weighted-average shares outstanding: Diluted shares 27,447,565 26,111,201 27,241,970 26,111,201
Earnings per share: Basic $ 0.00 $ 0.01 $ 0.03 $ 0.02
Earnings per share: Diluted $ 0.00 $ 0.01 $ 0.03 $ 0.02