The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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Organization and Summary of Significant Accounting Policies - Non-controlling Interests (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) partner	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) partner	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Noncontrolling Interest [Line Items]
Impairment of oil and natural gas properties	$ 0	$ 0	$ 0	$ 0	$ 0	$ 867,048
Ownership percentage by noncontrolling owners					50.00%
Equity of non-controlling interest	16,743,391		16,743,391		$ (2,428,885)	(2,721,019)	$ (1,468,823)
Net loss attributable to non-controlling interest	(5,954)	(12,033)	(31,752)	(95,229)	(54,975)	(728,218)
Non-controlling Interest
Noncontrolling Interest [Line Items]
Equity of non-controlling interest	9,023,414		9,023,414		7,885,166	5,828,141	$ 3,639,359
Net loss attributable to non-controlling interest	$ 5,954	$ 12,033	$ 31,752	$ 95,229	$ 54,975	728,218
Subsidiaries
Noncontrolling Interest [Line Items]
Non-controlling Interest, number of owners	2		2		2
Ownership percentage by noncontrolling owners	50.00%		50.00%		50.00%
Navitus
Noncontrolling Interest [Line Items]
Non-controlling Interest, number of owners \| partner	4		4
Reclass prior period contribution to related party payable					$ 150,000	$ 150,000