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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]    
Revenue, net - mineral property sale $ 0 $ 408
Costs, expenses and other    
Exploration expense 413 1,807
Depreciation and amortization 25 25
Mineral property impairment 6 0
General and administrative 1,044 1,368
Total costs, expenses and other 1,488 3,200
Interest and dividend income (net) 127 252
Other income 104 0
Loss on derivative instruments (92) (38)
Gain on sale of marketable equity securities 50 0
Unrealized gain (loss) on marketable equity securities 360 (711)
Total other income (expense) 549 (497)
Net loss $ (939) $ (3,289)
Loss per common share:    
Basic and diluted $ (0.02) $ (0.06)
Weighted average shares outstanding:    
Basic and diluted (in thousands) 58,116 58,143