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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (320) $ (3,099)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 14 11
Stock-based compensation 444 421
Gain on disposal of mineral property interests, net (2,883)  
Loss on other investments   30
Change in working capital account items:    
Other current assets 148 120
Accounts payable, accrued liabilities and other 145 (8)
Net cash used in operating activities (2,452) (2,525)
Cash flows from investing activities:    
Disposition of short-term investments, net 11 400
Additions to plant and equipment (5)  
Proceeds from option/sale agreements, net 2,500 1,100
Net cash provided by investing activities 2,506 1,500
Cash flows from financing activities:    
Proceeds from equity financing, net   610
Payment of taxes from withheld shares (327) (194)
Net cash provided by/(used in) financing activities (327) 416
Net decrease in cash and cash equivalents (273) (609)
Cash and cash equivalents, beginning of period 12,757 7,762
Cash and cash equivalents, end of period $ 12,484 $ 7,153