Unproved Oil and Gas Properties, Full Cost Method (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Oil and Gas Property [Abstract]
Inclusive of non-cash amounts	$ 62,000	$ 164,000	$ 139,000	$ 174,000