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Note I - Stock-based Compensation (Tables) | 6 Months Ended
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Oct. 31, 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 8, 2028 |
Shares available for grant at October 31, 2018 |  |  | 298,500 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Six Months Ended October 31,
|  | 2018 |  | 2017
Expected term (years) |  |  | 5.5 |  |  |  | 5.5 |
Risk-free interest rate |  |  | 2.79 | % |  |  | 1.81 | %
Volatility |  |  | 36 | % |  |  | 36 | %
Dividend yield |  |  | - |  |  |  | - |
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block] |
|  | Six Months Ended October 31,
(Dollars in thousands) |  | 2018 |  | 2017
Options exercised |  |  | 220,750 |  |  |  | 113,000 |
Cash received from option exercises |  | $ | 4,294 |  |  | $ | 822 |
Intrinsic value of options exercised |  | $ | 8,317 |  |  | $ | 2,998 |

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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=109197908&loc=d3e5070-113901 + Details
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