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Note 9 - Subsequent Events (Details Textual) - USD ($)
3 Months Ended
Jul. 31, 2020
Jul. 30, 2020
Jul. 20, 2020
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       0
Subsequent Event [Member]        
Dividends Payable, Amount Per Share (in dollars per share)     $ 0.28  
Dividends Payable $ 5,600,000      
Dividends Payable, Date Declared     Jul. 20, 2020  
Dividends Payable, Date of Record     Jul. 31, 2020  
Dividends Payable, Date to be Paid     Aug. 07, 2020  
Subsequent Event [Member] | Chief Executive Officer [Member]        
Annual Salary $ 626,860 $ 607,880    
Subsequent Event [Member] | Chief Executive Officer [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 37,800      
Subsequent Event [Member] | Employees [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 30,390      
Subsequent Event [Member] | Director [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 37,500