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Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013 | Oct. 31, 2015 | Oct. 31, 2014 | Oct. 31, 2013 | Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) | $ 0.16 | $ 0.15 | $ 0.15 | $ 0.16 | $ 0.15 | $ 0.15 | $ 0.16 | $ 0.15 | $ 0.15 | $ 0.17 | $ 0.15 | $ 0.15

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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