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Stockholders' Equity (Details 2) (USD $)
 12 Months Ended
Jun. 30, 2012
Series A Cumulative Perpetual Preferred Stock  
Net proceeds from issuances of preferred stock $ 6,930,535
Preferred stock dividends paid 630,391
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%
Preferred stock, liquidation preference (in dollars per share) $ 25.00
Net proceeds from issuances of preferred stock 6,930,535
Dividend payable monthly on preferred stock (in dollars per share) $ 0.177083
Preferred stock dividends paid $ 630,391
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
Series A cumulative perpetual preferred stock | Minimum
  
Series A Cumulative Perpetual Preferred Stock  
Redemption price per share $ 25.25
Series A cumulative perpetual preferred stock | Maximum
  
Series A Cumulative Perpetual Preferred Stock  
Redemption price per share $ 25.75
Series A cumulative perpetual preferred stock | Weighted average
  
Series A Cumulative Perpetual Preferred Stock  
Weighted average sales price (in dollars per share) $ 23.80