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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Net operating loss carryover [1] $ 5,154 $ 4,098  
Property and equipment 3,939 3,468  
Percentage depletion and contribution carryovers [1] 1,855 1,833  
Alternative minimum tax credit carryover [1] 42  
Equity method investment and other 246 615  
Deferred compensation liability 7 41  
Asset retirement obligations 315 181  
Stock-based compensation 115 68  
Lease obligations 32 44  
Total deferred tax assets 11,663 10,390  
Lease assets (28) (40)  
Total deferred tax liabilities (28) (40)  
Net deferred tax assets 11,635 10,350  
Less valuation allowance (11,635) (10,350) $ (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.