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Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares | 3 Months Ended
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Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) | $ 0.20 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.20 | $ 0.19 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.17 | $ 0.17 | $ 0.17

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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