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Consolidated Condensed Statement of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares | Jan. 31, 2018 | Jan. 19, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016
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Retained Earnings [Member] |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) | $ 0.18 | $ 0.20 | $ 0.18 | $ 0.18 | $ 0.17 | $ 0.17 | $ 0.17

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