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Note K - Stock-based Compensation Plans (Tables) | 12 Months Ended
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Apr. 30, 2021
Notes Tables |
Stock Option Plan Comparison [Table Text Block] |
| 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, 2030
Shares available for grant at April 30, 2021 | 245,000
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | April 30, 2021 |  |  | April 30, 2020 |  |  | April 30, 2019 |
Expected terms (years) |  |  | 5.5 |  |  |  | 5.5 |  |  |  | 5.5 |
Risk-free interest rate |  |  | 0.36% |  |  |  | 1.75 |  |  |  | 2.79% |
Volatility |  |  | 50% |  |  |  | 39 |  |  |  | 36% |
Dividend yield |  |  | - |  |  |  | - |  |  |  | - |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number |  |  | Exercise |  |  | Proceeds |  |  | Weighted Average |
|  | of |  |  | Price |  |  | on |  |  | Exercise Price per |
|  | Options |  |  | per Share |  |  | Exercise |  |  | Share |
|  |  |  |  |  |  |  |  |  | (in thousands) |  |  |  |  |
Outstanding at April 30, 2018 |  |  | 695,500 |  |  |  |  |  |  | $ | 26,683 |  |  | $ | 30.50 |
Granted |  |  | 145,000 |  |  | 53.30 to54.85 |  |  |  | 7,915 |  |  |  | 54.58 |
Exercised |  |  | (275,000 | ) |  | 18.86 to53.30 |  |  |  | (8,511 | ) |  |  | 30.95 |
Outstanding at April 30, 2019 |  |  | 565,500 |  |  |  |  |  |  | $ | 26,087 |  |  | $ | 46.13 |
Granted |  |  | 225,000 |  |  | 99.05 to109.06 |  |  |  | 24,287 |  |  |  | 107.95 |
Exercised |  |  | (121,250 | ) |  | 22.87 to53.02 |  |  |  | (4,517 | ) |  |  | 37.25 |
Cancelled |  |  | (1,500 | ) |  |  | $53.02 |  |  |  | (80 | ) |  |  | 53.02 |
Outstanding at April 30, 2020 |  |  | 667,750 |  |  |  |  |  |  | $ | 45,777 |  |  | $ | 68.55 |
Granted |  |  | 30,000 |  |  |  | $65.95 |  |  |  | 30 |  |  |  | 65.95 |
Exercised |  |  | (131,350 | ) |  | 24.69 to99.05 |  |  |  | (6,730 | ) |  |  | 51.24 |
Outstanding at April 30, 2021 |  |  | 566,400 |  |  |  |  |  |  | $ | 39,077 |  |  | $ | 72.43 |
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block] |
|  | Years Ended April 30, |
(Dollars in thousands) |  | 2021 |  |  | 2020 |  |  | 2019 |
Options Exercised |  |  | 131,350 |  |  |  | 121,250 |  |  |  | 275,000 |
Cash Received from Options Exercised |  | $ | 5,120 |  |  | $ | 2,928 |  |  | $ | 5,663 |
Intrinsic Value of Options Exercised |  | $ | 7,894 |  |  | $ | 7,580 |  |  | $ | 10,817 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested shares at April 30, 2018 |  |  | 179,000 |  |  | $ | 45.96 |
Shares granted |  |  | 3,000 |  |  |  | 53.30 |
Shares vested |  |  | - |  |  |  | - |
Shares cancelled |  |  | (1,500 | ) |  |  | 36.38 |
Unvested shares at April 30, 2019 |  |  | 180,500 |  |  | $ | 46.16 |
Shares granted |  |  | 12,328 |  |  |  | 102.03 |
Shares vested |  |  | (7,000 | ) |  |  | 52.10 |
Shares cancelled |  |  | (1,000 | ) |  |  | 37.07 |
Unvested shares at April 30, 2020 |  |  | 184,828 |  |  | $ | 49.71 |
Shares granted |  |  | 7,690 |  |  |  | 98.43 |
Shares vested |  |  | - |  |  |  | - |
Shares cancelled |  |  | (500 | ) |  |  | 35.00 |
Unvested shares at April 30, 2021 |  |  | 192,018 |  |  | $ | 51.70 |

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