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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 |  |

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