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Note 5 - Revolving Credit Facility (Tables)
 9 Months Ended
Dec. 30, 2017
Notes Tables  
Schedule of Line of Credit Facilities [Table Text Block]
   
Third Quarter
    
Year-to-Date
  
   
2018
    
2017
    
2018
    
2017
  
   
(In thousands)
    
(In thousands)
  
Reported end of period:
                                
Outstanding borrowings
   $
290,196
     $
232,586
     $
290,196
     $
232,586
  
Weighted average interest rate
    
3.04
%
    
2.00
%
    
3.04
%
    
2.00
%
Reported during the period:
                                
Maximum amount of borrowings
   $
296,088
     $
349,710
     $
296,088
     $
361,800
  
Average outstanding borrowings
   $
280,960
     $
301,395
     $
246,414
     $
289,949
  
Weighted average interest rate
    
2.82
%
    
1.89
%
    
2.59
%
    
1.88
%