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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Costs, expenses and other    
Exploration expense $ 699 $ 628
Depreciation and amortization 13 5
General and administrative 1,202 2,163
Property abandonment and impairment 13
Total costs, expenses and other 1,914 2,809
Other (expense) income    
Interest expense and dividend income (net) 123 44
Gain on sale of marketable equity securities 578 40
Gain on derivative instruments 271 672
Loss on sale of assets (14)
Gain on warrant liability 4
Total other income (expense) 972 746
Loss before income tax (942) (2,063)
Income tax benefit 353
Net income (loss) $ (942) $ (1,710)
Basic and diluted $ (0.02) $ (0.04)
Weighted average shares outstanding    
Basic and diluted 47,990 38,906