2. Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Numerator:
Net income available to common shareholders	$ (150,626)	$ 2,603	$ 1,298,026	$ 834,608
Denominator:
Weighted-average shares outstanding: Basic	26,111,201	26,111,201	26,111,201	26,111,201
Incremental shares from assumed conversion of options	0	1,336,364	1,447,399	1,130,769
Diluted shares	26,111,201	27,447,565	27,558,600	27,241,970