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Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Loss carryovers | $ 12,636 | $ 13,284
Investment in mineral property | 1,669 | 1,669
Capitalized exploration costs | 410 | 652
Stock option compensation expense | 286 | 228
Unrealized loss on derivative securities | 148 | 237
Other | 110 | 135
Valuation allowance | (15,050) | (15,999)
Total deferred tax assets | 209 | 206
Deferred tax liabilities: |  |
Unrealized gains on marketable equity securities | 207 | 198
Other | 2 | 8
Total deferred tax liabilities | 209 | 206
Net deferred tax liabilities | $ 0 | $ 0

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