Supplementary Financial Information on Oil and Natural Gas Exploration, Development and Production Activities (Unaudited) - Proved Reserves Attributable to Consolidated Subsidiary (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Future cash inflows	$ 2,345,940	$ 4,920,190
Future costs:
Production	(964,520)	(2,144,600)
Development	(87,650)	(87,650)
Future cash flows	1,293,770	2,687,940
10% annual discount for estimated timing of cash flow	(421,640)	(1,223,370)
Standardized measure of discounted cash flow	$ 872,130	1,464,570	$ 2,422,100
Ownership percentage by noncontrolling owners	50.00%
Consolidated Entities
Future costs:
Standardized measure of discounted cash flow	$ 436,065	$ 732,285