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Note K - Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Apr. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Option Plan Comparison [Table Text Block] |
|  | 1997 Plan |  | 2007 Plan
Minimum exercise price as a percentage of fair market value at date of grant |  | 100% |  | 100%
Last expiration date for outstanding options |  | July 2, 2017 |  | November 20, 2024
Shares available for grant at April 30, 2015 |  | - |  | 290,500
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| April 30, 2015 | April 30, 2014 | April 30, 2013
Expected terms (years) | 5.4 | 5.0 | 5.0
Risk-free interest rate | 1.64% | 0.67% | 0.78%
Volatility | 34% | 50% | 50%
Dividend yield | - | - | -
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Shares |  |  | Exercise Price per Share |  |  | Proceeds on Exercise |  |  | Weighted Average Exercise Price per Share |
|  |  |  |  |  |  |  |  | (in thousands) |  |  |  |
Outstanding at April 30, 2012 |  |  | 1,118,250 |  |  | $11.83 | to | $45.72 |  |  | $ | 22,881 |  |  | $ | 20.46 |
Granted |  |  | 40,000 |  |  | $44.14 | to | $45.46 |  |  |  | 1,801 |  |  |  | 45.02 |
Exercised |  |  | (35,750 | ) |  | $11.83 | to | $23.34 |  |  |  | (790 | ) |  |  | 22.13 |
Outstanding at April 30, 2013 |  |  | 1,122,500 |  |  | $11.90 | to | $45.72 |  |  | $ | 23,892 |  |  | $ | 21.28 |
Granted |  |  | 25,000 |  |  | $44.52 | to | $46.44 |  |  |  | 1,122 |  |  |  | 44.90 |
Exercised |  |  | (30,500 | ) |  | $23.34 | to | $23.75 |  |  |  | (720 | ) |  |  | 23.58 |
Outstanding at April 30, 2014 |  |  | 1,117,000 |  |  | $11.90 | to | $46.44 |  |  | $ | 24,294 |  |  | $ | 21.75 |
Granted |  |  | 89,000 |  |  | $36.54 | to | $50.25 |  |  |  | 3,997 |  |  |  | 44.91 |
Exercised |  |  | (212,250 | ) |  | $11.90 | to | $45.46 |  |  |  | (4,143 | ) |  |  | 19.52 |
Cancelled |  |  | (12,000 | ) |  | $41.86 | to | $45.72 |  |  |  | (540 | ) |  |  | 45.08 |
Outstanding at April 30, 2015 |  |  | 981,750 |  |  | $11.90 | to | $50.25 |  |  | $ | 23,608 |  |  | $ | 24.05 |
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block] |
| Twelve Months Ended April 30, |
(Dollars in thousands) | 2015 |  | 2014 |  | 2013 |
Options Exercised |  |  | 212,250 |  |  |  | 30,500 |  |  |  | 35,750 |
Cash Received from Options Exercised |  | $ | 4,143 |  |  | $ | 720 |  |  | $ | 790 |
Intrinsic Value of Options Exercised |  | $ | 5,983 |  |  | $ | 563 |  |  | $ | 811 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested shares at April 30, 2014 |  |  | 20,000 |  |  | $ | 24.47 |
Shares granted |  |  | 9,500 |  |  |  | 52.10 |
Shares vested |  |  | (20,000 | ) |  |  | 24.47 |
Unvested shares at April 30, 2015 |  |  | 9,500 |  |  | $ | 52.10 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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