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7. Oil and Gas Properties (Tables)
 3 Months Ended
Mar. 31, 2017
Oil and Gas Exploration and Production Industries Disclosures [Abstract]  
Gross and net productive oil wells
    March 31, 2016  
    Gross     Net  
North Dakota     352       10.64  
Montana     5       0.37  
Total     357       11.01  
Capitalized costs for oil and gas properties
    Three Months
Ended		  
    March 31, 2016  
Purchases of oil and gas properties and development costs for cash   $ 1,149,789  
Purchase of oil and gas properties accrued at period-end     6,662,200  
Purchase of oil and gas properties accrued at beginning of period     (6,899,503 )
Capitalized asset retirement costs     –  
Total purchase and development costs, oil and gas properties   $ 912,486