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Note K - Stock-based Compensation Plans (Tables) | 12 Months Ended
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Apr. 30, 2022
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, 2031
Shares available for grant at April 30, 2022 |  |  | 215,000
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | April 30, 2022 |  |  | April 30, 2021 |  |  | April 30, 2020 |
Expected terms (years) |  |  | 5.5 |  |  |  | 5.5 |  |  |  | 5.5 |
Risk-free interest rate |  |  | 0.86% |  |  |  | 0.36% |  |  |  | 1.75% |
Volatility |  |  | 51% |  |  |  | 50% |  |  |  | 39% |
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, 2019 |  |  | 565,500 |  |  |  |  |  |  | $ | 26,087 |  |  | $ | 46.13 |
Granted |  |  | 225,000 |  |  | 99.0505 to109.06.06 |  |  |  | 24,287 |  |  |  | 107.95 |
Exercised |  |  | (121,250 | ) |  | 22.8787 to53.02.02 |  |  |  | (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 | ) |  | 24.6969 to99.05.05 |  |  |  | (6,730 | ) |  |  | 51.24 |
Outstanding at April 30, 2021 |  |  | 566,400 |  |  |  |  |  |  | $ | 39,077 |  |  | $ | 72.43 |
Granted |  |  | 30,000 |  |  |  | $ 150.83 |  |  |  | 30 |  |  |  | 150.83 |
Exercised |  |  | (94,000 | ) |  | 26.3737 to150.83.83 |  |  |  | (6,276 | ) |  |  | 66.76 |
Cancelled |  |  | (1,000 | ) |  |  | $ 41.86 |  |  |  | (42 | ) |  | $ | 41.86 |
Outstanding at April 30, 2022 |  |  | 501,400 |  |  |  |  |  |  | $ | 32,789 |  |  |  |  |
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block] |
|  | Years Ended April 30, |
(Dollars in thousands) |  | 2022 |  |  | 2021 |  |  | 2020 |
Options Exercised |  |  | 94,000 |  |  |  | 131,350 |  |  |  | 121,250 |
Cash Received from Options Exercised |  | $ | 591 |  |  | $ | 5,120 |  |  | $ | 2,928 |
Intrinsic Value of Options Exercised |  | $ | 7,124 |  |  | $ | 7,894 |  |  | $ | 7,580 |
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, 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 |
Shares granted |  |  | 11,287 |  |  |  | 121.17 |
Shares vested |  |  | (6,500 | ) |  |  | 39.14 |
Shares cancelled |  |  | (15,691 | ) |  |  | 59.99 |
Unvested shares at April 30, 2022 |  |  | 181,114 |  |  | $ | 55.76 |

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