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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 26, 2018
Aug. 26, 2018
May 27, 2018
Aug. 26, 2018
Percentage of Stock Options, Exercisable One Year From Date of Grant   25.00%    
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   10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     2,650 2,650
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 10 $ 10   $ 10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 3.66
2018 Stock Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0      
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate       2.83%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       24.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate       2.32%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term       5 years 73 days