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Stockholders' Equity (Details 2) (USD $)
 3 Months Ended
Sep. 30, 2012
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Sep. 30, 2011
Jun. 30, 2012
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Series A Cumulative Perpetual Preferred Stock      
Preferred stock, liquidation preference (in dollars per share) 25.00   25.00
Net proceeds from issuances of preferred stock   $ 6,054,456  
Preferred stock dividends paid 168,575 127,835  
Series A cumulative perpetual preferred stock
      
Series A Cumulative Perpetual Preferred Stock      
Number of shares sold of series A cumulative perpetual preferred stock   282,255  
Preferred stock dividend rate (as a percent)   8.50%  
Preferred stock, liquidation preference (in dollars per share)   25.00  
Net proceeds from issuances of preferred stock   6,054,456  
Dividend payable monthly on preferred stock (in dollars per share)   $ 0.177083  
Preferred stock dividends paid $ 168,575 $ 127,835  
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   62,255  
Series A cumulative perpetual preferred stock | Minimum
      
Series A Cumulative Perpetual Preferred Stock      
Redemption price per share (in dollars per share)   $ 25.25  
Series A cumulative perpetual preferred stock | Maximum
      
Series A Cumulative Perpetual Preferred Stock      
Redemption price per share (in dollars per share)   $ 25.75