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Selected Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 11,426,864 $ 10,249,566 $ 11,066,911 $ 8,537,871 $ 8,835,702 $ 9,525,437 $ 8,529,817 $ 7,593,940 $ 41,281,212 $ 34,484,896 $ 26,349,502
Operating income 5,182,663 3,663,267 4,829,252 2,536,459 2,583,912 3,893,236 3,675,381 2,727,593 16,211,641 12,880,122 1,665,187
Net income available to common shareholders $ 4,532,750 $ 3,068,354 $ 9,876,848 $ 2,140,532 $ 1,500,761 $ 2,419,143 $ 2,307,634 $ 563,345 $ 19,618,484 $ 6,790,883 $ 23,986,060
Basic net income per share (in dollars per share) $ 0.14 $ 0.09 $ 0.30 $ 0.06 $ 0.05 $ 0.07 $ 0.07 $ 0.02 $ 0.59 $ 0.21 $ 0.73
Diluted net income per share (in dollars per share) $ 0.14 $ 0.09 $ 0.30 $ 0.06 $ 0.07 $ 0.07 $ 0.07 $ 0.05 $ 0.59 $ 0.21 $ 0.73