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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Revenue, net – mineral property sale $ 502 $ 408 $ 502
Costs, expenses and other:        
Exploration expense 702 162 865 342
Depreciation 6 6 13 12
General and administrative 321 762 746 1,165
Total costs, expenses and other 1,029 930 1,624 1,519
Interest income (net) 90 37 162 63
Unrealized (loss) on marketable equity securities (63) (222) (389) (663)
Total other income (loss) 27 (185) (227) (600)
Net loss $ (1,002) $ (613) $ (1,443) $ (1,617)
Basic and diluted $ (0.02) $ (0.01) $ (0.02) $ (0.03)
Weighted average shares outstanding:        
Basic and diluted 58,141 58,390 58,151 58,439