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Preferred and Common Stock - Schedule of Stock Options Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Number of option shares |  |  |
Ending balance (in shares) | 43,189 |  |
Stock Options |  |  |
Number of option shares |  |  |
Beginning balance (in shares) | 109,827 | 181,673 | 222,050
Exercised (in shares) | (66,638) | (71,546) | (40,377)
Forfeited (in shares) |  | (300) |
Ending balance (in shares) | 43,189 | 109,827 | 181,673
Weighted average option exercise price |  |  |
Beginning balance (in Dollars per share) | $ 44.39 | $ 39.48 | $ 38.51
Exercised (in Dollars per share) | 44.39 | 32.02 | 34.11
Forfeited (in Dollars per share) |  | 25.26 |
Ending balance (in Dollars per share) | $ 44.39 | $ 44.39 | $ 39.48

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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