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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