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Interest Rate Swap Agreements (Tables)
6 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of locations and amounts of loss and gain in income
     Three months ended
September 30, 2017
(In thousands)
     Six months ended
September 30, 2017
(In thousands)
 

Periodic change in fair value of interest rate swap agreements

   $ 8      $ 17  

Periodic settlement differentials included in interest expense

     8        18  
  

 

 

    

 

 

 

Loss recognized in income

   $ 16      $ 35  
  

 

 

    

 

 

 
Schedule of variable rates received and average fixed rates paid under the swap agreements
     Three months ended
September 30,
2017
    Six months ended
September 30,
2017
 

Variable rate received

     1.22     1.05

Fixed rate paid

     0.87     0.91