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Interest Rate Swap Agreements (Tables)
 3 Months Ended
Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of notional amounts of interest rate swaps
     Three months ended June 30,  
     2014      2013  

Notional amounts at April 1

    $ 50,000,000       $ 50,000,000   

New contracts

      —           —     

Matured contracts

      —           —     
  

 

 

     

 

 

  

Notional amounts at June 30

    $ 50,000,000       $ 50,000,000   
  

 

 

     

 

 

  
Schedule of locations and amounts of (gains) losses recognized in income
     Three months ended
June 30,		  
     2014      2013  

Periodic change in fair value of interest rate swap agreements

    $ 212,287       $ (833,259 ) 

Periodic settlement differentials included in interest expense

      98,992         93,314   
  

 

 

     

 

 

  

Total

    $ 311,279       $ (739,945 ) 
  

 

 

     

 

 

  
Schedule of variable rates received and average fixed rates paid under the swap agreements
     Three months ended
June 30,		  
     2014     2013  

Variable rate received

      0.15 %      0.20 % 

Fixed rate paid

      0.94 %      0.94 %