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Oil and natural gas properties (under successful efforts accounting) (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Extractive Industries [Abstract]    
Oil and natural gas properties $ 3,578,864 $ 2,838,573
Less: accumulated depletion (2,036,467) (1,942,380)
Total oil and gas properties, net $ 1,542,397 $ 896,193