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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Revenue, net - mineral property sale $ 0 $ 408
Costs, expenses and other:    
Exploration expense 113 163
Depreciation 6 7
General and administrative 336 425
Total costs, expenses and other 455 595
Interest income, net 81 72
Loss on derivative instruments (25) 0
Gain on sale of marketable equity securities 25 0
Unrealized loss on marketable equity securities (233) (326)
Total other loss (152) (254)
Net loss $ (607) $ (441)
Loss per common share:    
Basic and diluted $ (0.01) $ (0.01)
Weighted average shares outstanding:    
Basic and diluted 58,130 58,158