8. Oil and Gas Properties (Tables)

6 Months Ended

Jun. 30, 2017

Oil and Gas Exploration and Production Industries Disclosures [Abstract]

Gross and net productive oil wells

	June 21, 2016
	Gross		Net
North Dakota		352		10.64
Montana		5		0.37
Total		357		11.01

Capitalized costs for oil and gas properties

	Six Months Ended
	June 30, 2016
Purchases of oil and gas properties and development costs for cash	$	4,858,134
Purchase of oil and gas properties accrued at period-end		3,155,016
Purchase of oil and gas properties accrued at beginning of period (prior to disposition)		(6,899,503	)
Capitalized asset retirement costs		4,737
Total purchase and development costs, oil and gas properties	$	1,118,384