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Note I - Stock-based Compensation (Tables) | 9 Months Ended
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Jan. 31, 2021
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, 2030 |
Shares available for grant at January 31, 2021 |  |  | 245,000 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Nine Months Ended January 31, |
|  | 2021 |  |  | 2020 |
Expected term (years) |  |  | 5.5 |  |  |  | 5.5 |
Risk-free interest rate |  |  | 0.36 | % |  |  | 1.75 | %
Volatility |  |  | 50 | % |  |  | 39 | %
Dividend yield |  |  | - |  |  |  | - |
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block] |
|  | Nine Months Ended January 31, |
(Dollars in thousands) |  | 2021 |  |  | 2020 |
Options exercised |  |  | 107,000 |  |  |  | 112,250 |
Cash received from option exercises |  | $ | 4,731 |  |  | $ | 2,849 |
Intrinsic value of options exercised |  | $ | 4,868 |  |  | $ | 6,861 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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