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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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