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Note 6 - Shareholders' Equity (Tables)
 12 Months Ended
Mar. 31, 2019
Notes Tables  
Dividends Declared [Table Text Block]
Declaration Date
  
Per Share
Dividend
  
Record Date
  
Total Amount
(In thousands)
  
Payment Date
                     
May 7, 2018
   $
0.25
  
May 18, 2018
   $
5,150
  
May 25, 2018
July 23, 2018
   $
0.27
  
August 3, 2018
   $
5,584
  
August 10, 2018
October 22, 2018
   $
0.27
  
November 5, 2018
   $
5,582
  
November 16, 2018
January 21, 2019
   $
0.27
  
February 4, 2019
   $
5,582
  
February 15, 2019