Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Net operating loss carryforwards	$ 6,232	$ 7,573
Depletion carryforwards	2,569	2,166
Accrual and other	3,997	1,372
Stock-based compensation	469	445
Asset retirement obligations	4,659	4,567
Property and equipment	(2,253)	(42)
Total deferred tax assets	15,673	16,081
Deferred tax liabilities:
Interest in partnerships	(338)	(512)
ASC 842 Operating Leases	(12)
Derivative and other	(1,689)	(1,008)
Less valuation allowance	(13,634)	(14,561)
Net deferred tax asset