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Interest Rate Swap Agreements (Tables)
 3 Months Ended
Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of locations and amounts of (gains) losses recognized in income
     Three months ended
June 30,		  
     2015      2014  

Periodic change in fair value of interest rate swap agreements

    $ 43,562       $ 212,287   

Periodic settlement differentials included in interest expense

      94,953         98,992   
  

 

 

     

 

 

  

Loss recognized in income

    $ 138,515       $ 311,279   
  

 

 

     

 

 

  
Schedule of variable rates received and average fixed rates paid under the swap agreements
     Three months ended
June 30,		  
     2015     2014  

Variable rate received

      0.18 %      0.15 % 

Fixed rate paid

      0.94 %      0.94 %