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Stock-Based Compensation (Tables) | 12 Months Ended
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Apr. 30, 2020
Stock-Based Compensation |
Schedule of stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Restated 2006 Plan | ​ | 2002 Plan | ​ | 1992 Plan |
​ |  | ​ |  | Weighted |  | ​ |  | Weighted |  | ​ |  | Weighted |
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise |
​ | ​ | Shares | ​ | Price | ​ | Shares | ​ | Price | ​ | Shares | ​ | Price |
Outstanding at April 30, 2017 |  | 446,624 | ​ |  | 24.93 |  | — | ​ |  | — |  | 43,415 | ​ |  | 0.59 | ​
Options granted |  | — | ​ |  | — |  | — | ​ |  | — |  | — | ​ |  | — | ​
Options exercised |  | (107,598) | ​ |  | 23.80 |  | — | ​ |  | — |  | (25,113) | ​ |  | 0.59 | ​
Options canceled |  | — | ​ |  | — |  | — | ​ |  | — |  | — | ​ |  | — | ​
Outstanding at April 30, 2018 |  | 339,026 | ​ |  | 25.29 |  | — | ​ |  | — |  | 18,302 | ​ |  | 0.59 | ​
Options granted |  | — | ​ |  | — |  | — | ​ |  | — |  | — | ​ |  | — | ​
Options exercised |  | (2,000) | ​ |  | 32.19 |  | — | ​ |  | — |  | (4,000) | ​ |  | 0.59 | ​
Options canceled |  | — | ​ |  | — |  | — | ​ |  | — |  | — | ​ |  | — | ​
Outstanding at April 30, 2019 |  | 337,026 | ​ |  | 25.25 |  | — | ​ |  | — |  | 14,302 | ​ |  | 0.59 | ​
Options granted |  | — | ​ |  | — |  | — | ​ |  | — |  | — | ​ |  | — | ​
Options exercised |  | (3,000) | ​ |  | 31.15 |  | — | ​ |  | — |  | (13,189) | ​ |  | 0.59 | ​
Options canceled |  | — | ​ |  | — |  | — | ​ |  | — |  | — | ​ |  | — | ​
Outstanding at April 30, 2020 |  | 334,026 | ​ |  | 25.19 |  | — | ​ |  | — |  | 1,113 | ​ |  | 0.59 | ​
Options exercisable at April 30, 2020 |  | 318,026 | ​ | $ | 25.12 |  | — | ​ | $ | — |  | 1,113 | ​ | $ | 0.59 | ​
​
Schedule of the status of the Company's non-vested stock options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant Date |
Non-vested Options | ​ | Options | ​ | Fair Value |
Non-vested at April 30, 2019 |  | 39,510 | ​ | $ | 10.90 | ​
Granted |  | — | ​ |  | — | ​
Expired |  | — | ​ |  | — | ​
Canceled |  | — | ​ |  | — | ​
Vested |  | (23,510) | ​ |  | 11.40 | ​
Non-vested at April 30, 2020 |  | 16,000 | ​ | $ | 10.16 | ​
​
Schedule of information concerning outstanding and exercisable options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Options Outstanding | ​ | ​ | ​ | ​ | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​ | Options Exercisable |
| ​ | ​ | ​ |  | ​ |  | Remaining |  | Weighted |  | ​ |  | Weighted |
​ | ​ | ​ | ​ | ​ | As of | ​ | Contractual | ​ | Average | ​ | As of | ​ | Average |
​ | ​ | ​ | ​ | ​ | April 30, | ​ | Life In | ​ | Exercise | ​ | April 30, | ​ | Exercise |
Range of Exercise Prices | ​ | 2020 | ​ | Years | ​ | Price | ​ | 2020 | ​ | Price |
$ | 0.59 | - | 19.16 |  | 55,113 |  | 2.93 | ​ | $ | 17.90 |  | 55,113 | ​ | $ | 17.90 | ​
​ | 19.17 | - | 26.24 |  | 58,500 |  | 2.86 | ​ |  | 20.54 |  | 58,500 | ​ |  | 20.54 | ​
​ | 26.25 | - | 26.99 |  | 80,000 |  | 5.15 | ​ |  | 26.70 |  | 64,000 | ​ |  | 26.70 | ​
​ | 27.00 | - | 27.99 | ​ | 50,000 | ​ | 3.56 | ​ | ​ | 27.27 | ​ | 50,000 | ​ | ​ | 27.27 | ​
​ | 28.00 | - | 29.26 |  | 50,000 |  | 1.83 | ​ |  | 28.72 |  | 50,000 | ​ |  | 28.72 | ​
​ | 29.27 | - | 31.27 |  | 41,526 |  | 3.94 | ​ |  | 31.13 |  | 41,526 | ​ |  | 31.13 | ​
$ | 0.59 | - | 31.27 |  | 335,139 |  | 3.50 | ​ | $ | 25.11 |  | 319,139 | ​ | $ | 25.03 | ​
​
Schedule of Company's restricted stock awards | Information related to the Company’s restricted stock awards at April 30, 2020 and for the year then ended is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Restated 2006 Plan |
​ |  | ​ |  | Weighted |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant Date |
​ | ​ | Shares | ​ | Fair Value |
Unvested stock at April 30, 2019 |  | 226,159 | ​ | $ | 43.35 | ​
Stock granted |  | 131,991 | ​ |  | 52.71 | ​
Stock vested |  | (143,962) | ​ |  | 34.03 | ​
Stock canceled |  | (12,541) | ​ |  | 47.86 | ​
Unvested stock at April 30, 2020 |  | 201,647 | ​ | $ | 55.84 | ​

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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://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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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