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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Costs, expenses and other:    
Exploration expense $ 151 $ 122
Depreciation and amortization 1 1
General and administrative 300 442
Total costs, expenses and other 452 565
Other income    
Interest income (net) 46 12
Gain on sale of marketable equity securities 221
Gain (loss) on derivative instruments 172 (1)
Gain on warrant liability 3
Total other income 439 14
Loss before income tax (13) (551)
Income tax (expense) benefit 62
Net loss $ (13) $ (489)
Loss per common share: Basic and diluted $ 0.00 $ (0.01)
Weighted average shares outstanding:    
Basic and diluted 38,692 39,121