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Note K - Stock-based Compensation Plans (Tables) | 12 Months Ended
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Apr. 30, 2018
Notes Tables |
Stock Option Plan Comparison [Table Text Block] |
|  | Restated Option Plan
Minimum exercise price as a percentage of fair market value at date of grant |  | 100%
Last expiration date for outstanding options |  | May 1, 2027
Shares available for grant at April 30, 2018 |  | 297,500
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | April 30, 2018 |  | April 30, 2017 |  | April 30, 2016
Expected terms (years) |  | 5.5 |  | 5.5 |  | 5.5
Risk-free interest rate |  | 1.81% |  | 1.47% |  | 1.55%
Volatility |  | 36% |  | 36% |  | 34%
Dividend yield |  | - |  | - |  | -
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Options |  | Exercise Price per Share |  | Proceeds on Exercise |  | Weighted Average Exercise Price per Share
|  |  |  |  |  | (in thousands) |  |
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 |
Granted |  |  | 45,000 |  |  | $26.42 | to | $34.09 |  |  | 1,301 |  |  |  | 28.90 |
Exercised |  |  | (264,500 | ) |  | $11.90 | to | $28.13 |  |  | (4,739 | ) |  |  | 17.92 |
Cancelled |  |  | (30,250 | ) |  | $41.86 | to | $53.02 |  |  | (1,559 | ) |  |  | 51.55 |
Outstanding at April 30, 2017 |  |  | 1,028,500 |  |  |  |  | $ | 34,084 |  |  | $ | 33.51 |
Granted |  |  | 25,000 |  |  |  | $37.30 |  |  |  | 933 |  |  |  | 37.30 |
Exercised |  |  | (323,000 | ) |  | $11.90 | to | $37.94 |  |  | (6,692 | ) |  |  | 20.72 |
Expired |  |  | (15,000 | ) |  | $44.52 | - | $51.81 |  |  | (710 | ) |  |  | 47.26 |
Cancelled |  |  | (20,000 | ) |  | $41.86 | to | $53.02 |  |  | (932 | ) |  |  | 46.61 |
Outstanding at April 30, 2018 |  |  | 695,500 |  |  |  |  | $ | 26,683 |  |  | $ | 30.50 |
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block] |
|  | Years Ended April 30,
(Dollars in thousands) |  | 2018 |  | 2017 |  | 2016
Options Exercised |  |  | 323,000 |  |  |  | 264,500 |  |  |  | 30,750 |
Cash Received from Options Exercised |  | $ | 2,832 |  |  | $ | 2,609 |  |  | $ | 400 |
Intrinsic Value of Options Exercised |  | $ | 8,381 |  |  | $ | 6,439 |  |  | $ | 943 |
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 |  |  | - |  |  |  | - |
Shares cancelled |  |  | - |  |  |  | - |
Unvested shares at April 30, 2016 |  |  | 9,500 |  |  | $ | 52.10 |
Shares granted |  |  | 10,000 |  |  |  | 39.14 |
Shares vested |  |  | - |  |  |  | - |
Shares cancelled |  |  | (2,500 | ) |  |  | 49.51 |
Unvested shares at April 30, 2017 |  |  | 17,000 |  |  | $ | 44.86 |
Shares granted |  |  | 166,500 |  |  |  | 45.86 |
Shares vested |  |  | - |  |  |  | - |
Shares cancelled |  |  | (4,500 | ) |  |  | 38.28 |
Unvested shares at April 30, 2018 |  |  | 179,000 |  |  | $ | 45.96 |

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