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Selected Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2013 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | [1] | Mar. 31, 2016 | Dec. 31, 2015 | [2] | Sep. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Revenues |  |  | $ 8,835,702 | $ 9,525,437 | $ 8,529,817 | $ 7,593,940 | $ 7,240,434 | $ 5,106,735 | $ 6,622,927 | $ 7,379,406 |  | $ 34,484,896 | $ 26,349,502 | $ 27,841,265
Operating income (loss) |  |  | 2,583,912 | 3,893,236 | 3,675,381 | 2,727,593 | 954,823 | (681,147) | (454,987) | 1,846,498 |  | 12,880,122 | 1,665,187 | 8,583,697
Net income (loss) available to common shareholders |  |  | $ 1,500,761 | $ 2,419,143 | $ 2,307,634 | $ 563,345 | $ 20,705,894 | $ (298,183) | $ 654,697 | $ 2,923,652 |  | 6,790,883 | 23,986,060 | 4,317,555
Basic and diluted net income per share (in dollars per share) |  |  | $ 0.05 | $ 0.07 | $ 0.07 | $ 0.02 | $ 0.63 | $ (0.01) | $ 0.02 | $ 0.09 |  |  |  |
Dividends per share declared and paid in the quarter (in dollars per share) | $ 0.065 | $ 0.10 | $ 0.07 | $ 0.07 | $ 0.065 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 |  |  |
Restructuring charges (income) |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  | 4,488 | 1,257,433 | (5,431)
Delhi field litigation settlement gain |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 28,096,500 | $ 0
Dehli Field Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delhi field litigation settlement gain |  |  |  |  |  |  |  |  |  |  |  | $ 28,100,000 |  |
[1] | Includes gain on settlement of Delhi field litigation of $28.1 million.
[2] | Includes $1.3 million restructuring charge.

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