Note 6 - Stock-based Compensation (Details Textual) - The 2018 Stock Option Plan [Member] - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Jul. 24, 2018 |
May 31, 2026 |
Jul. 18, 2024 |
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized | 1,550,000 | ||
| Percentage of Stock Options, Exercisable One Year From Date of Grant | 25.00% | ||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 1 year | ||
| Percentage of Stock Options Exercisable On Each Succeeding Year from Date of Grant | 25.00% | ||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | 10 years | ||
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 666 | ||
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 2 months 19 days |