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Note K - Stock-based Compensation Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Number of Shares (in shares) | 667,750 | 565,500 | 695,500 |
Proceeds on Exercise | $ 39,077 | $ 45,777 | $ 26,087 | $ 26,683
Weighted Average Exercise Price (in dollars per share) | $ 68.55 | $ 46.13 | $ 30.50 |
Number of Shares, Granted (in shares) | 30,000 | 225,000 | 145,000 |
Exercise Price, Granted (in dollars per share) | $ 65.95 | $ 107.95 | $ 54.58 |
Proceeds on Exercise, Granted | $ 30 | $ 24,287 | $ 7,915 |
Number of Shares, Exercised (in shares) | (131,350) | (121,250) | (275,000) |
Exercise Price, Exercised (in dollars per share) | $ 51.24 | $ 37.25 | $ 30.95 |
Proceeds on Exercise, Exercised | $ (6,730) | $ (4,517) | $ (8,511) |
Number of Shares, Cancelled (in shares) |  | (1,500) |  |
Exercise Price, Cancelled (in dollars per share) |  | $ 53.02 |  |
Proceeds on Exercise, Cancelled |  | $ (80) |  |
Number of Shares (in shares) | 566,400 | 667,750 | 565,500 | 695,500
Weighted Average Exercise Price (in dollars per share) | $ 72.43 | $ 68.55 | $ 46.13 | $ 30.50
Minimum [Member] |  |  |  |
Exercise Price, Granted (in dollars per share) |  | 99.05 | 53.30 |
Exercise Price, Exercised (in dollars per share) | 24.69 | 22.87 | 18.86 |
Maximum [Member] |  |  |  |
Exercise Price, Granted (in dollars per share) |  | 109.06 | 54.85 |
Exercise Price, Exercised (in dollars per share) | $ 99.05 | $ 53.02 | $ 53.30 |

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- Definition The total proceeds that could be collected from the exercise of stock options granted under share-based compensation arrangement. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders on the exercise of granted stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders on the exercise of outstanding stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References No definition available. + Details
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- Definition Represents the proceeds from cancellation of the shares. + References No definition available. + Details
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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=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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