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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]    
Revenue - mineral property sale $ 408 $ 502
Costs, expenses and other    
Exploration expense 1,807 1,254
Depreciation and amortization 25 25
General and administrative 1,368 1,954
Total costs, expenses and other 3,200 3,233
Interest and dividend income (net) 252 192
Unrealized loss on marketable equity securities (711) (1,058)
Loss on derivative instruments (38) 0
Loss on sale of assets 0 (1)
Total other income (expense) (497) (867)
Net loss $ (3,289) $ (3,598)
Loss per common share:    
Basic and diluted $ (0.06) $ (0.06)
Weighted average shares outstanding:    
Basic and diluted 58,143 58,360