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Preferred and Common Stock (Tables) | 12 Months Ended
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Apr. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock Options Activity | Information concerning the issuance of stock options under the Plan and Prior Plans is presented in the following table:
| Number of option shares |  | Weighted average option exercise price
Outstanding at April 30, 2012 | 1,053,509 |  |  | $ | 32.59 |
Granted | — |  |  | — |
Exercised | (198,200 | ) |  | 23.82 |
Forfeited | (500 | ) |  | 14.08 |
Outstanding at April 30, 2013 | 854,809 |  |  | $ | 34.64 |
Granted | — |  |  | — |
Exercised | (140,785 | ) |  | 23.93 |
Forfeited | (2,000 | ) |  | 44.39 |
Outstanding at April 30, 2014 | 712,024 |  |  | $ | 36.73 |
Granted | — |  |  | — |
Exercised | (310,224 | ) |  | 36.96 |
Forfeited | — |  |  | — |
Outstanding at April 30, 2015 | 401,800 |  |  | $ | 36.55 |
Schedule of Shares Outstanding and Weighted-Average Remaining Contractual Life by Exercise Range | The number of shares and weighted average remaining contractual life of the options by range of applicable exercise prices at April 30, 2015 were as follows:
Range of exercise prices | Number of shares |  | Weighted average exercise price |  | Weighted average remaining contractual life (years)
20.68-24.11 | 7,000 |  |  | 22.62 |  |  | 1.2
25.26-26.92 | 159,600 |  |  | 25.61 |  |  | 3.8
44.39 | 235,200 |  |  | 44.39 |  |  | 6.2
| 401,800 |  |  |  |  |
Schedule of Restricted Stock Units Award Activity | Information concerning the issuance of restricted stock units under the Plan is presented in the following table:
Unvested at April 30, 2012 | 38,198 |
Granted | 46,998 |
Vested | (14,000 | )
Forfeited | — |
Unvested at April 30, 2013 | 71,196 |
Granted | 91,650 |
Vested | (14,150 | )
Forfeited | (150 | )
Unvested at April 30, 2014 | 148,546 |
Granted | 91,000 |
Vested | (38,198 | )
Forfeited | (7,418 | )
Unvested at April 30, 2015 | 193,930 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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