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Note 8 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jul. 31, 2017
Jul. 28, 2017
Jul. 24, 2017
Jun. 30, 2017
Stock Issued During Period, Shares, Restricted Stock Award, Gross       0
Subsequent Event [Member]        
Dividends Payable, Date to be Paid     Aug. 18, 2017  
Dividends Payable, Amount Per Share     $ 0.20  
Dividends, Paid-in-kind $ 4.1      
Dividends Payable, Date Declared     Jul. 24, 2017  
Dividends Payable, Date of Record     Aug. 07, 2017  
Subsequent Event [Member] | 2016 Employee Equity Compensation Restricted Stock Plan [Member]        
Stock Issued During Period, Shares, Restricted Stock Award, Gross   49,200    
Subsequent Event [Member] | 2015 Outside Director Equity Compensation Restricted Stock Plan ("2015 Director Plan") [Member]        
Stock Issued During Period, Shares, Restricted Stock Award, Gross   30,000