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Note 10 - Subsequent Events (Details Textual) - USD ($)
3 Months Ended
Jul. 30, 2021
Jul. 26, 2021
Jul. 03, 2021
Jun. 30, 2021
Jun. 30, 2020
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       1,380 0
Subsequent Event [Member]          
Dividends Payable, Amount Per Share (in dollars per share)   $ 0.30      
Dividends Payable, Current   $ 6,100,000      
Dividends Payable, Date Declared   Jul. 26, 2021      
Dividends Payable, Date of Record   Aug. 06, 2021      
Dividends Payable, Date to be Paid   Aug. 13, 2021      
Subsequent Event [Member] | Restricted Stock [Member] | 2016 Employee Equity Compensation Restricted Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 41,745        
Subsequent Event [Member] | Restricted Stock [Member] | 2015 Outside Director Equity Compensation Restricted Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 37,500        
Subsequent Event [Member] | Chief Financial Officer [Member]          
Additional Stipend to Be Paid for Each Month of Additional Responsibilities     $ 10,000