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Note 10 - Fair Value of Financial Instruments (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
2018
            
2017
  
   
Carrying
    
Estimated
    
Carrying
    
Estimated
  
   
Amount
    
Fair Value
    
Amount
    
Fair Value
  
   
(In thousands)
  
Long-term debt, including current portion
   $
417,834
     $
417,485
     $
332,633
     $
332,926
  
                                 
Capital leases, including current portion
   $
42,009
     $
39,023
     $
39,033
     $
37,505
  
      .