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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Revenue, net - mineral property sale $ 0 $ 0 $ 0 $ 408
Costs, expenses and other:        
Exploration expense 44 702 157 865
Depreciation 7 6 13 13
General and administrative 254 321 590 746
Total costs, expenses and other 305 1,029 760 1,624
Interest income, net 27 90 108 162
Other income 44 0 44 0
Gain (loss) on derivative instruments 5 0 (20) 0
Gain on sale of marketable equity securities 0 0 25 0
Unrealized gain (loss) on marketable equity securities 484 (63) 251 (389)
Total other loss 560 27 408 (227)
Net loss $ 255 $ (1,002) $ (352) $ (1,443)
Loss per common share:        
Basic $ 0 $ (0.02) $ (0.01) $ (0.02)
Diluted $ 0 $ (0.02) $ (0.01) $ (0.02)
Weighted average shares outstanding:        
Basic 58,116 58,141 58,123 58,151
Diluted 58,249 58,141 58,123 58,151