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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
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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.

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