Oil and natural gas properties (under successful efforts accounting) (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Extractive Industries [Abstract]
Oil and natural gas properties	$ 3,566,211	$ 2,838,573
Less: accumulated depletion	(1,953,660)	(1,942,380)
Total oil and gas properties, net	$ 1,612,551	$ 896,193

No definition available.

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-10.(b))

-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

+ Details

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- Definition

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

+ References

+ Details

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- Definition

Oil and Gas Property, Successful Efforts Method, Net of Impairment

+ References

No definition available.

+ Details

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