Basic and diluted net income per share (DETAILS) (USD $)	3 Months Ended		6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Net income available to common shareholders	$ 252	$ 187	$ 425	$ 240
Weighted average number of common shares outstanding used in calculation of basic earnings per share	995,468	995,135	995,295	995,135
Incremental shares from the assumed exercise of dilutive stock options	2,283	0	1,277	0
Weighted average number of common shares outstanding used in calculating diluted earnings per share	997,751	995,135	996,572	995,135