Oil and natural gas properties - Schedule of Oil and Natural Gas Properties (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Extractive Industries [Abstract]
Proved property	$ 9,940,660	$ 8,903,060
Unproved property	1,375,940	1,365,951
Work in process	0	0
Total oil and natural gas properties, at cost	11,316,600	10,269,011
Less: accumulated impairment	(8,283,321)	(7,430,438)
Oil and natural gas properties, net of impairment	3,033,279	2,838,573
Less: accumulated depletion	(2,274,188)	(1,942,380)
Total oil and gas properties, net	$ 759,091	$ 896,193

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- Definition

Amount of accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method. Oil and gas property include, but not limited to, the entity's wells and related equipment and facilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61901-109447

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-Section S99
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-Subparagraph (SX 210.4-10.(b))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

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- Definition

Accumulated impairment of oil and gas property carried under the successful effort method.

+ References

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-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
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- Definition

Oil and Gas properties, gross, carried under the successful effort method.

+ References

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- Definition

Oil and gas properties net of accumulated depreciation, depletion, amortization, impairment, and abandonment, carried under the successful effort method.

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- Definition

Oil and Gas properties with proved reserves under the successful effort method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Glossary Proved Properties
-URI http://asc.fasb.org/extlink&oid=6522428

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- Definition

Oil and Gas properties with unproved reserves under the successful effort method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Drilling In Process Costs

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Oil and Gas Property Successful Effort Method Cost

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