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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, 2017 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Proceeds on Exercise, Exercised | $ (4,363) | $ (400) | $ (4,143) |
Proceeds on Exercise, Granted | 1,301 | 16,471 | 3,997 |
Proceeds on Exercise | $ 34,460 | $ 39,081 | $ 23,608 | $ 24,294
Number of Shares (in shares) | 1,278,250 | 981,750 | 1,117,000 |
Exercise Price (in dollars per share) | $ 30.57 | $ 24.05 | $ 21.75 |
Number of Shares, Granted (in shares) | 45,000 | 338,750 | 89,000 |
Exercise Price, Granted (in dollars per share) | $ 28.90 | $ 48.62 | $ 44.91 |
Number of Shares, Exercised (in shares) | (264,500) | (30,750) | (212,250) |
Exercise Price, Exercised (in dollars per share) | $ 17.92 | $ 13 | $ 19.52 |
Number of Shares, Cancelled (in shares) | (30,250) | (11,500) | (12,000) |
Exercise Price, Cancelled (in dollars per share) | $ 51.55 | $ 52.05 | $ 45.08 |
Proceeds on Exercise, Cancelled | $ (1,559) | $ (598) | $ (540) |
Number of Shares (in shares) | 1,028,500 | 1,278,250 | 981,750 | 1,117,000
Exercise Price (in dollars per share) | $ 33.51 | $ 30.57 | $ 24.05 | $ 21.75
Minimum [Member] |  |  |  |
Exercise Price (in dollars per share) |  | 11.90 | 11.90 |
Exercise Price, Granted (in dollars per share) | 26.42 | 26.37 | 36.54 |
Exercise Price, Exercised (in dollars per share) | 11.90 | 11.90 | 11.90 |
Exercise Price, Cancelled (in dollars per share) | 41.86 | 41.86 | 41.86 |
Exercise Price (in dollars per share) |  |  | 11.90 | 11.90
Maximum [Member] |  |  |  |
Exercise Price (in dollars per share) |  | 53.02 | 46.44 |
Exercise Price, Granted (in dollars per share) | 34.09 | 53.02 | 50.25 |
Exercise Price, Exercised (in dollars per share) | 28.13 | 23.34 | 45.46 |
Exercise Price, Cancelled (in dollars per share) | $ 53.02 | 53.02 | 45.72 |
Exercise Price (in dollars per share) |  |  | $ 53.02 | $ 46.44

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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 Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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