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Selected Quarterly Financial Data (Unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Selected Quarterly Financial Data (Unaudited)                      
Revenues $ 5,399,749 $ 6,010,567 $ 5,648,058 $ 4,291,546 $ 4,581,946 $ 4,848,534 $ 4,646,702 $ 3,884,856 $ 21,349,920 $ 17,962,038 $ 7,530,875
Operating income 2,351,546 3,394,531 3,024,721 1,930,556 2,120,109 2,273,461 2,426,838 2,008,866 10,701,354 8,829,274 193,147
Net income available to common shareholders 944,012 2,228,467 1,790,696 990,951 926,581 1,299,525 1,259,950 1,015,683 5,954,126 4,501,739 (241,553)
Basic net income per share (in dollars per share) $ 0.03 $ 0.08 $ 0.06 $ 0.04 $ 0.03 $ 0.05 $ 0.05 $ 0.04 $ 0.21 $ 0.16 $ (0.01)
Diluted net income per share (in dollars per share) $ 0.03 $ 0.07 $ 0.06 $ 0.03 $ 0.03 $ 0.04 $ 0.04 $ 0.03 $ 0.19 $ 0.14 $ (0.01)
Difference in the actual taxable income and expected book income due to lower Delhi revenue                 600,000    
Difference in the actual taxable income and expected book income due to higher general and administrative expense                 $ 400,000