Commitments and contingencies (Details Narrative) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Environmental liabilities	$ 2,088,158	$ 2,100,000
Bloodworth
Contingency held for lawsuits	280,000
Keybanc Capital Markets
Contingency held for lawsuits	$ 751,334

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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

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-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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