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Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Cash dividends paid, per share | $ 0.66 | $ 0.58 | $ 0.51
Stock options exercised, shares | 36,800 | 50,075 | 84,000
Additional Paid-in Capital [Member] |  |  |
Stock options exercised, shares | 36,800 | 50,075 | 84,000
Retained Earnings [Member] |  |  |
Cash dividends paid, per share | $ 0.66 | $ 0.58 | $ 0.51

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