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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Costs, expenses and other:    
Exploration expense $ 147 $ 113
Depreciation 5 6
General and administrative 280 336
Total costs, expenses and other 432 455
Interest and dividend income (net) 6 81
Other income 10 0
Loss on derivative instruments (3) (25)
Gain on sale of marketable equity securities 13 25
Unrealized loss on marketable equity securities (122) (233)
Total other loss (96) (152)
Net loss $ (528) $ (607)
Loss per common share:    
Basic and diluted $ (0.01) $ (0.01)
Weighted average shares outstanding:    
Basic and diluted (in thousands) 58,254 58,130