Consolidated Condensed Statement of Changes in Shareholders' Equity (unaudited) (Parentheticals) (USD $)	3 Months Ended
	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010
Statement Of Stockholders Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 0.15	$ 0.20	$ 0.20	$ 0.20	$ 2.00	$ 0.20