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7. Asset Retirement Obligation (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]      
Beginning Balance $ 147,690 $ 150,080 $ 142,040
Accretion during the year 5,137 (2,390) 8,040
Ending Balance $ 152,827 $ 147,690 $ 150,080