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Note K - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Minimum [Member] |  |  |  |
Exercise Price (in dollars per share) | $ 11.90 | $ 11.90 | $ 11.90 |
Exercise Price, Granted (in dollars per share) | 26.37 | 36.54 | 44.52 |
Exercise Price, Exercised (in dollars per share) | 11.90 | 11.90 | 23.34 |
Exercise Price (in dollars per share) |  | 11.90 | 11.90 | $ 11.90
Exercise Price, Cancelled (in dollars per share) | 41.86 | 41.86 |  |
Maximum [Member] |  |  |  |
Exercise Price (in dollars per share) | 53.02 | 46.44 | 45.72 |
Exercise Price, Granted (in dollars per share) | 53.02 | 50.25 | 46.44 |
Exercise Price, Exercised (in dollars per share) | 23.34 | 45.46 | 23.75 |
Exercise Price (in dollars per share) |  | 53.02 | $ 46.44 | $ 45.72
Exercise Price, Cancelled (in dollars per share) | $ 53.02 | $ 45.72 |  |
Number of Shares (in shares) | 981,750 | 1,117,000 | 1,122,500 |
Exercise Price (in dollars per share) | $ 24.05 | $ 21.75 | $ 21.28 |
Proceeds on Exercise | $ 39,081 | $ 23,608 | $ 24,294 | $ 23,892
Number of Shares, Granted (in shares) | 338,750 | 89,000 | 25,000 |
Exercise Price, Granted (in dollars per share) | $ 48.62 | $ 44.91 | $ 44.90 |
Proceeds on Exercise, Granted | $ 16,471 | $ 3,997 | $ 1,122 |
Number of Shares, Exercised (in shares) | (30,750) | (212,250) | (30,500) |
Exercise Price, Exercised (in dollars per share) | $ 13 | $ 19.52 | $ 23.58 |
Proceeds on Exercise, Exercised | $ (400) | $ (4,143) | $ (720) |
Number of Shares (in shares) | 1,278,250 | 981,750 | 1,117,000 | 1,122,500
Exercise Price (in dollars per share) | $ 30.57 | $ 24.05 | $ 21.75 | $ 21.28
Number of Shares, Cancelled (in shares) | (11,500) | (12,000) |  |
Exercise Price, Cancelled (in dollars per share) | $ 52.05 | $ 45.08 |  |
Proceeds on Exercise, Cancelled | $ (598) | $ (540) |  |

X
- 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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Balance Type: | debit
Period Type: | duration

X
- 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 cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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X
- 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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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X
- 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=6415400&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 of the plan that expired. + 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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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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