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Note K - Stock-based Compensation Plans (Tables) | 12 Months Ended
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Apr. 30, 2016
Notes Tables |
Stock Option Plan Comparison [Table Text Block] |
|  | 1997 Plan |  | Restated Option 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 |  |  |  | March 2, 2026 |
Shares available for grant at April 30, 2016 |  |  | - |  |  |  | 263,250 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | April 30, 2016 |  | April 30, 2015 |  | April 30, 2014
Expected terms (years) |  |  | 5.5 |  |  |  | 5.4 |  |  |  | 5.0 |
Risk-free interest rate |  |  | 1.55% |  |  |  | 1.64% |  |  |  | 0.67% |
Volatility |  |  | 34% |  |  |  | 34% |  |  |  | 50% |
Dividend yield |  |  | - |  |  |  | - |  |  |  | - |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number |  | Exercise |  | Proceeds |  | Weighted Average
|  | of |  | Price |  | on |  | Exercise Price per
|  | Shares |  | per Share |  | Exercise |  | Share
|  |  |  |  |  | (in thousands) |  |
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 | $53.02 |  | $ | 23,608 |  |  | $ | 24.05 |
Granted |  |  | 338,750 |  |  | $26.37 | to | $53.02 |  |  | 16,471 |  |  |  | 48.62 |
Exercised |  |  | (30,750 | ) |  | $11.90 | to | $23.34 |  |  | (400 | ) |  |  | 13.00 |
Cancelled |  |  | (11,500 | ) |  | $41.86 | to | $53.02 |  |  | (598 | ) |  |  | 52.05 |
Outstanding at April 30, 2016 |  |  | 1,278,250 |  |  |  |  |  |  | $ | 39,081 |  |  | $ | 30.57 |
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block] |
|  | Twelve Months Ended April 30,
(Dollars in thousands) |  | 2016 |  | 2015 |  | 2014
Options Exercised |  |  | 30,750 |  |  |  | 212,250 |  |  |  | 30,500 |
Cash Received from Options Exercised |  | $ | 400 |  |  | $ | 4,143 |  |  | $ | 720 |
Intrinsic Value of Options Exercised |  | $ | 943 |  |  | $ | 5,983 |  |  | $ | 563 |
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, 2015 |  |  | 9,500 |  |  | $ | 52.10 |
Shares granted |  |  | - |  |  |  |  |
Shares vested |  |  | - |  |  |  |  |
Unvested shares at April 30, 2016 |  |  | 9,500 |  |  | $ | 52.10 |

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