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Note 4 - Revolving Credit Facility (Tables)
 6 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Line of Credit Facilities [Table Text Block]
   
Second Quarter
    
Year-to-Date
  
   
2018
    
2017
    
2018
    
2017
  
   
(In thousands)
    
(In thousands)
  
Reported end of period:
                                
Outstanding borrowings
   $
272,609
     $
342,935
     $
272,609
     $
342,935
  
Weighted average interest rate
    
2.75
%
    
1.88
%
    
2.75
%
    
1.88
%
Reported during the period:
                                
Maximum amount of borrowings
   $
274,117
     $
361,800
     $
274,117
     $
361,800
  
Average outstanding borrowings
   $
244,160
     $
314,102
     $
229,235
     $
284,287
  
Weighted average interest rate
    
2.58
%
    
1.78
%
    
2.45
%
    
1.93
%