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Interest Rate Swap Agreements (Tables)
3 Months Ended
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of locations and amounts of losses recognized in income
    

Three months ended

June 30, 2017

 
     (In thousands)  

Periodic change in fair value of interest rate swap agreements

   $ (9

Periodic settlement differentials included in interest expense

     10  
  

 

 

 

Gain recognized in income

   $ 1  
  

 

 

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

Variable rate received

     1.02

Fixed rate paid

     0.92