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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (1,971) $ (320)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 10 14
Stock-based compensation 179 444
Gain on disposal of mineral property interests, net   (2,883)
Change in working capital account items:    
Other current assets 91 148
Accounts payable, accrued liabilities and other (85) 145
Net cash used in operating activities (1,776) (2,452)
Cash flows from investing activities:    
Maturities of short-term investments, net   11
Additions to plant and equipment   (5)
Proceeds from option/sale agreements, net   2,500
Net cash provided by investing activities   2,506
Cash flows from financing activities:    
Proceeds from equity financing, net 453  
Payment of taxes from withheld shares (142) (327)
Net cash provided by/(used in) financing activities 311 (327)
Net decrease in cash and cash equivalents (1,465) (273)
Cash and cash equivalents, beginning of period 8,110 12,757
Cash and cash equivalents, end of period $ 6,645 $ 12,484