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Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Loss carryovers $ 13,284 $ 12,432
Investment in mineral property 1,669 1,669
Capitalized exploration costs 652 877
Stock option compensation expense 228 150
Unrealized loss on derivative securities 237 60
Other 135 135
Valuation allowance (15,999) (15,099)
Total deferred tax assets 206 224
Deferred tax liabilities:    
Unrealized gains on marketable equity securities 198 209
Other 8 15
Total deferred tax liabilities 206 224
Net deferred tax liabilities $ 0 $ 0