Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands |
|
3 Months Ended |
Jul. 24, 2018 |
May 29, 2022 |
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |
|
131,600
|
| The 2018 Stock Option Plan [Member] |
|
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |
800,000
|
|
| 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
|
|
| The 2018 Stock Option Plan [Member] | Directors and Certain of Employees [Member] |
|
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |
|
131,600
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |
|
$ 2.66
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate |
|
3.32%
|
| The 2018 Stock Option Plan [Member] | Directors and Certain of Employees [Member] | Minimum [Member] |
|
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |
|
2.69%
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate |
|
28.20%
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year) |
|
5 years 4 months 24 days
|
| The 2018 Stock Option Plan [Member] | Directors and Certain of Employees [Member] | Maximum [Member] |
|
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |
|
2.70%
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate |
|
28.30%
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year) |
|
8 years 1 month 6 days
|
| The 2018 Stock Option Plan [Member] | Directors and Certain of Employees [Member] | Share-Based Payment Arrangement, Option [Member] |
|
|
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |
|
$ 338
|