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Interest Rate Swap Agreements (Tables)
12 Months Ended
Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of locations and amounts of losses recognized in income
     (In thousands)  
     2017      2016  

Periodic change in fair value of interest rate swap agreements

   $ 222      $ (24

Periodic settlement differentials included in interest expense

     (179      (343
  

 

 

    

 

 

 

Gain (loss) recognized in income

   $ 43      $ (367
  

 

 

    

 

 

 
Schedule of variable rates received and average fixed rates paid under the swap agreements
     2017     2016  

Average variable rate received

     0.58     0.26

Average fixed rate paid

     0.94     0.94