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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Net operating loss carryover [1] $ 4,098 $ 3,594  
Property and equipment 3,468 4,306  
Percentage depletion and contribution carryovers [1] 1,833 1,721  
Alternative minimum tax credit carryover [1] 42 42  
Equity method investment and other 615 592  
Deferred compensation liability 41 9  
Asset retirement obligations 181 221  
Stock-based compensation 68 61  
Lease obligations 44  
Total deferred tax assets 10,390 10,546  
Property and equipment  
Lease assets (40)  
Other  
Total deferred tax liabilities (40)  
Net deferred tax assets 10,350 10,546  
Less valuation allowance (10,350) (10,546) $ (11,361)
Net deferred tax asset  
[1] In December 2017, the Company paid down debt through the issuance of common stock. This issuance represented a 49.3% ownership change in the Company. This change in ownership, combined with other equity events, triggered loss limitations under Internal Revenue Code ("I.R.C.") Section 382. As a result, the Company wrote-off $29.8 million of gross deferred tax assets in 2017, and an additional $2.4 million in gross deferred tax assets in 2018. Since the Company has maintained a valuation allowance against these tax assets there is no impact to the consolidated statement of operations in either year.