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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net income/(loss) $ (15,237) $ 420
Adjustments to reconcile net income/(loss) to net cash used in operations:    
Depreciation and amortization 49 48
Stock-based compensation 887 913
Gain on disposal of mineral property interests, net (2,100) (6,108)
Write-down of plant and equipment 5,500  
Gain on other investments (46) (2,405)
Change in working capital account items:    
Other current assets (50) (279)
Accounts payable, accrued liabilities and other 377 456
Net cash used in operating activities (10,620) (6,955)
Cash flows from investing activities:    
Proceeds from sales of marketable securities 339 5,788
Disposition of short-term investments, net 16 2,860
Additions to plant and equipment (139) (68)
Proceeds from option/sale agreements, net 2,415 3,048
Net cash provided by investing activities 2,631 11,628
Cash flows from financing activities:    
Proceeds from equity financing, net 13,385 1,768
Payment of taxes from withheld shares (401) (124)
Proceeds from exercise of stock options   37
Net cash provided by financing activities 12,984 1,681
Net increase in cash and cash equivalents 4,995 6,354
Cash and cash equivalents, beginning of period 7,762 1,408
Cash and cash equivalents, end of period $ 12,757 $ 7,762