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Preferred and Common Stock- Schedule of Restricted Stock and Restricted Stock Units Granted (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 12, 2016 | Jun. 05, 2015 | Sep. 19, 2014 | Jun. 06, 2014 | Sep. 13, 2013 | Jun. 19, 2013 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  |  |  | 114,200 | 91,000 | 91,650
Officers & Key employees | 2009 Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Shares Granted |  | 104,200 |  | 91,000 |  | 77,650 |  |  |
Fair Value at Grant Date |  | $ 9,135 |  | $ 6,584 |  | $ 4,816 |  |  |
Officers & Key employees | 2009 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Shares Granted |  | 48,913 |  | 30,538 |  |  |  |  |
Fair Value at Grant Date |  | $ 4,288 |  | $ 2,209 |  |  |  |  |
Non-employee board members | 2009 Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Shares Granted |  |  |  |  | 14,000 |  |  |  |
Fair Value at Grant Date |  |  |  |  | $ 958 |  |  |  |
Non-employee board members | 2009 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Shares Granted |  |  | 13,955 |  |  |  |  |  |
Fair Value at Grant Date |  |  | $ 990 |  |  |  |  |  |
CEO | 2009 Stock Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Shares Granted | 10,000 |  |  |  |  |  |  |  |
Fair Value at Grant Date | $ 1,060 |  |  |  |  |  |  |  |
CEO | 2009 Stock Incentive Plan | Restricted Stock Units | Awards to Vest May 1, 2017 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Vesting percentage | 20.00% |  |  |  |  |  |  |  |
CEO | 2009 Stock Incentive Plan | Restricted Stock Units | Awards to Vest May 1, 2018 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Vesting percentage | 20.00% |  |  |  |  |  |  |  |
CEO | 2009 Stock Incentive Plan | Restricted Stock Units | Awards to Vest May 1, 2019 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Vesting percentage | 20.00% |  |  |  |  |  |  |  |
CEO | 2009 Stock Incentive Plan | Restricted Stock Units | Awards to Vest May 1, 2020 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Vesting percentage | 20.00% |  |  |  |  |  |  |  |
CEO | 2009 Stock Incentive Plan | Restricted Stock Units | Awards to Vest May 1, 2021 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Vesting percentage | 20.00% |  |  |  |  |  |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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