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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jul. 24, 2018
Apr. 30, 2023
May 28, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross     133,300
Share-Based Payment Arrangement, Plan Modification, Incremental Cost     $ 109
Special Dividend [Member]      
Common Stock, Dividends, Per Share, Cash Paid   $ 1.00  
The 2018 Stock Option Plan [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized 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     133,300
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     $ 387
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 3.01
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate     3.82%
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     3.61%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate     28.50%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term     4 years 10 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     3.85%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate     29.60%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term     8 years 3 months 18 days