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7. Property and Equipment (Details-Depreciation) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property and equipment:    
Depletion of costs for evaluated oil and gas properties $ 9,278,108 $ 9,359,952
Depreciation and amortization of other property and equipment 16,295 29,138
Total depreciation, amortization and depletion $ 9,294,403 $ 9,389,090