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Selected Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2019 | Jun. 30, 2018
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues | $ 10,373,396 | $ 9,501,028 | $ 11,048,118 | $ 12,307,079 | $ 11,426,864 | $ 10,249,566 | $ 11,066,911 | $ 8,537,871 | $ 43,229,621 | $ 40,773,527
Operating income | 3,955,194 | 2,952,955 | 4,733,747 | 5,994,927 | 5,182,663 | 3,663,267 | 4,829,252 | 2,536,459 | 17,636,823 | 16,211,641
Net income available to common shareholders | $ 3,277,825 | $ 2,398,875 | $ 3,904,565 | $ 5,795,801 | $ 4,532,750 | $ 3,068,354 | $ 9,876,848 | $ 2,140,532 | $ 15,377,066 | $ 19,618,484
Basic net income per share (in dollars per share) | $ 0.10 | $ 0.07 | $ 0.12 | $ 0.18 | $ 0.14 | $ 0.09 | $ 0.30 | $ 0.06 | $ 0.46 | $ 0.59
Diluted net income per share (in dollars per share) | $ 0.10 | $ 0.07 | $ 0.12 | $ 0.17 | $ 0.14 | $ 0.09 | $ 0.30 | $ 0.06 | $ 0.46 | $ 0.59
Tax cuts and jobs act benefit |  |  |  |  |  |  | $ 6,000,000 |  |  |
Affiliate Of Enduro Resource Partners LLC |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Other income |  |  |  | $ 1,100,000 |  |  |  |  |  |

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