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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Costs, expenses and other:        
Exploration expense $ 555 $ 951 $ 830 $ 1,177
Depreciation 6 8 12 16
General and administrative 315 277 791 664
Total costs, expenses and other 876 1,236 1,633 1,857
Other (loss) income        
Interest and dividend income 26 41 53 68
Gain (loss) on derivative instruments 23 (3) 23 (4)
(Loss) gain on sale of marketable equity securities 0 (78) 0 (159)
Unrealized gain (loss) on short-term investments 14 (47) 35 (98)
Unrealized (loss) gain on marketable equity securities (227) (368) 102 (155)
Total other (loss) income (164) (455) 213 (348)
Net (loss) income $ (1,040) $ (1,691) $ (1,420) $ (2,205)
(Loss) income per common share:        
Basic and diluted $ (0.02) $ (0.03) $ (0.02) $ (0.03)
Weighted average shares outstanding:        
Basic and diluted 64,807 64,769 64,804 63,748