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Preferred and Common Stock (Tables) | 12 Months Ended
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Apr. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Restricted Stock and Restricted Stock Unit Grants | The following table summarizes the equity-related grants made during the three-year period ended April 30, 2019:
Date of Grant | Type of Grant | Shares Granted | Recipients | Vesting Date | Fair Value at Grant Date
June 3, 2016 | Restricted Stock Units | 111,150 |  | Officers & Key employees | June 3, 2019 | $13,849
June 3, 2016 | Restricted Stock | 40,996 |  | Officers & Key Employees | Immediate (Annual Performance Goal) | $5,108
September 16, 2016 | Restricted Stock | 8,941 |  | Non-Employee Board Members | Immediate | $1,064
June 1, 2017 | Restricted Stock Units | 63,699 |  | Key Employees | June 1, 2020 | $7,388
July 14, 2017 | Restricted Stock Units*** | 61,126 |  | Officers | June 15, 2020 | $6,912
September 28, 2017 | Restricted Stock | 8,344 |  | Non-Employee Board Members | Immediate | $920
March 29, 2018 | Restricted Stock | 2,150 |  | Non-Employee Board Members | September 21, 2018 | $236
May 24, 2018 | Restricted Stock Units | 88,846 |  | Key Employees | May 24, 2021 | $8,593
June 8, 2018 | Restricted Stock Units*** | 75,402 |  | Officers | June 8, 2021 | $7,571
September 5, 2018 | Restricted Stock Units | 7,984 |  | Non-Employee Board Members | 2019 Annual Shareholders' Meeting Date | $920
*** This grant of restricted stock units includes time-based, performance-based and market-based awards. The performance-based awards included in the figure above represent a “target” amount; the final amount earned is based on the satisfaction of certain performance measures over a three-year performance period and will range from 0% to 200% of the “target". The market-based awards incorporate market conditions in determining fair value as of the grant date, and will also range from 0% to 200% of the "target". Total market-based expense of approximately $2.6 million for the 2017 grant and $2.8 million for the 2018 grant will be recognized on a straight-line basis over the vesting period, subject to acceleration for retirement provisions.
Schedule of Stock Options Activity | Information concerning the issuance of stock options under the Prior Plans is presented in the following table (no stock option awards have been granted under the 2018 Plan):
| Number of option shares |  | Weighted average option exercise price
Outstanding at April 30, 2016 | 291,200 |  |  | $ | 37.46 |
Granted | — |  |  | — |
Exercised | (69,150 | ) |  | 34.08 |
Forfeited | — |  |  | — |
Outstanding at April 30, 2017 | 222,050 |  |  | $ | 38.51 |
Granted | — |  |  | — |
Exercised | (40,377 | ) |  | 34.11 |
Forfeited | — |  |  | — |
Outstanding at April 30, 2018 | 181,673 |  |  | $ | 39.48 |
Granted | — |  |  | — |
Exercised | (71,546 | ) |  | 32.02 |
Forfeited | (300 | ) |  | 25.26 |
Outstanding at April 30, 2019 | 109,827 |  |  | $ | 44.39 |
Schedule of Restricted Stock Units Award Activity | Information concerning the issuance of restricted stock units under the Plan and the Prior Plans is presented in the following table:
Unvested at April 30, 2016 | 272,900 |
Granted | 111,150 |
Vested | (73,000 | )
Forfeited | (7,650 | )
Unvested at April 30, 2017 | 303,400 |
Granted | 126,980 |
Vested | (88,700 | )
Forfeited | (2,699 | )
Unvested at April 30, 2018 | 338,981 |
Granted | 172,232 |
Vested | (104,166 | )
Forfeited | (10,530 | )
Unvested at April 30, 2019 | 388,800 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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