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Interest Rate Swap Agreements (Tables)
 3 Months Ended
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of locations and amounts of (gains) losses recognized in income
   Three months ended
June 30,
(In thousands)		 
   2017   2016 

Periodic change in fair value of interest rate swap agreements

  $(9)   $(18) 

Periodic settlement differentials included in interest expense

   10    (63) 
  

 

 

   

 

 

 

Gain (loss) recognized in income

  $1   $(81) 
  

 

 

   

 

 

 
Schedule of variable rates received and average fixed rates paid under the swap agreements
   Three months ended
June 30,		 
   2017  2016 

Variable rate received

   1.02%   0.44% 

Fixed rate paid

   0.92%   0.94%