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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Costs, expenses and other:    
Exploration expense $ 275 $ 226
Depreciation 6 8
General and administrative 476 387
Total costs, expenses and other 757 621
Other (loss) income    
Interest and dividend income 27 27
Loss on derivative instruments   (1)
(Loss) gain on sale of marketable equity securities   (81)
Unrealized gain (loss) on short-term investments 21 (51)
Unrealized gain on marketable equity securities 329 213
Total other income 377 107
Net loss $ (380) $ (514)
Loss per common share:    
Basic and diluted $ (0.01) $ (0.01)
Weighted average shares outstanding:    
Basic and diluted 64,801 62,728