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Stockholders' Equity (Details 2) (USD $)
 9 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Jun. 30, 2012
Series A Cumulative Perpetual Preferred Stock      
Number of shares sold of series A cumulative perpetual preferred stock 0    
Preferred stock, liquidation preference (in dollars per share) $ 25.00   25.00
Net proceeds from issuances of preferred stock   $ 6,930,535  
Preferred stock dividends paid 505,726 461,815  
Series A cumulative perpetual preferred stock
      
Series A Cumulative Perpetual Preferred Stock      
Number of shares sold of series A cumulative perpetual preferred stock   317,319  
Preferred stock dividend rate (as a percent) 8.50% 8.50% 8.50%
Preferred stock, liquidation preference (in dollars per share)   $ 25.00  
Net proceeds from issuances of preferred stock   6,930,535  
Amount of sinking fund available to stockholders 0    
Redemption price prior to July 1, 2013 (in dollars per share) $ 25.50    
Redemption price for period July 1, 2013 through June 30, 2014 (in dollars per share) $ 25.25    
Dividend payable monthly on preferred stock (in dollars per share)   $ 0.177083  
Preferred stock dividends paid $ 505,726 $ 461,815  
Series A cumulative perpetual preferred stock | Underwritten public offering
      
Series A Cumulative Perpetual Preferred Stock      
Number of shares sold of series A cumulative perpetual preferred stock   220,000  
Series A cumulative perpetual preferred stock | At-the-market sales agreement
      
Series A Cumulative Perpetual Preferred Stock      
Number of shares sold of series A cumulative perpetual preferred stock   97,319