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Note 12 - Subsequent Events (Details Textual)
2 Months Ended 12 Months Ended
Jul. 26, 2019
USD ($)
shares
May 13, 2019
USD ($)
May 06, 2019
USD ($)
$ / shares
Mar. 16, 2019
USD ($)
Mar. 16, 2016
USD ($)
May 27, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
shares
Mar. 31, 2018
shares
Jul. 23, 2018
$ / shares
Jan. 22, 2018
$ / shares
May 08, 2017
$ / shares
Dividends Payable, Amount Per Share | $ / shares                 $ 0.27 $ 0.25 $ 0.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares             85,000        
Treasury Stock, Shares, Acquired | shares             0 0      
Forecast [Member]                      
Gross-up Payment, Percentage 28.20%                    
Chief Executive Officer [Member]                      
Salary and Wage, Officer, Excluding Cost of Good and Service Sold       $ 600,000 $ 600,000            
Chief Executive Officer [Member] | Forecast [Member]                      
Payment for Lost Compensation $ 10,800                    
Chief Executive Officer [Member] | Forecast [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 40,000                    
Subsequent Event [Member]                      
Dividends Payable, Amount Per Share | $ / shares     $ 0.27                
Dividends Payable     $ 5,600,000                
Treasury Stock, Shares, Acquired | shares           450,000          
Treasury Stock, Value, Acquired, Cost Method           $ 8,600,000          
Treasury Stock Acquired, Average Cost Per Share | $ / shares           $ 19.08          
Dividends Payable, Date Declared     May 06, 2019                
Dividends Payable, Date to be Paid     May 24, 2019                
Dividends Payable, Date of Record     May 17, 2019                
Subsequent Event [Member] | Chief Executive Officer [Member]                      
Salary and Wage, Officer, Excluding Cost of Good and Service Sold   $ 600,000                  
Executive Employment Agreement, Period of Notice Required for Termination of Employment in Event of Change in Control   30 days                  
Executive Employment Agreement, Salary Multiple of One-time Payment in Event of Termination Due to Change in Control   2