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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Cash dividends paid, per share | $ 0.51 | $ 0.47 | $ 0.44
Stock options exercised, shares | 84,000 | 29,075 | 97,250
Treasury stock, shares |  | 1,159 | 69,773
Common Stock [Member] |  |  |
Stock options exercised, shares | 84,000 | 29,075 | 97,250
Additional Paid-in Capital [Member] |  |  |
Stock options exercised, shares | 84,000 | 29,075 | 97,250
Treasury Stock [Member] |  |  |
Stock options exercised, shares | 84,000 | 29,075 | 97,250
Treasury stock, shares |  | 1,159 | 69,773
Retained Earnings [Member] |  |  |
Cash dividends paid, per share | $ 0.51 | $ 0.47 | $ 0.44
Stock options exercised, shares | 84,000 |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Stock options exercised, shares | 84,000 |  |

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