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6. Property and Equipment (Details-Depreciation) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Property and equipment:    
Depletion of costs for evaluated oil and gas properties [1] $ 0 $ 2,022,504
Depreciation and amortization of other property and equipment 3,100 3,885
Total depreciation, amortization and depletion $ 3,100 $ 2,026,389
[1] Presented as a component of loss from discontinued operations, net of income taxes.