Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares	3 Months Ended
	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015
Retained Earnings [Member]
Dividends declared per share (in dollars per share)	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.17	$ 0.16	$ 0.16	$ 0.16