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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net income/(loss) $ 420 $ (9,386)
Adjustments to reconcile net income/(loss) to net cash used in operations:    
Depreciation and amortization 48 52
Stock-based compensation 913 765
Gain on disposal of mineral property interests, net (6,108)  
Other gains and losses   (134)
(Gain)/Loss on other investments (2,405) 1,643
Change in working capital account items:    
Other current assets (279) (31)
Provision for environmental liability   (2)
Accounts payable, accrued liabilities and other 456 40
Net cash used in operating activities (6,955) (7,053)
Cash flows from investing activities:    
Proceeds from sales of marketable securities 5,788 413
Disposition (acquisitions) of short-term investments, net 2,860 3,737
Additions to plant and equipment (68) (40)
Proceeds from option/sale agreements, net 3,048 3,267
Net cash provided by investing activities 11,628 7,377
Cash flows from financing activities:    
Proceeds from equity financing, net 1,768  
Payment of taxes from withheld shares (124) (76)
Proceeds from exercise of stock options 37 89
Net cash provided by financing activities 1,681 13
Net increase in cash and cash equivalents 6,354 337
Cash and cash equivalents, beginning of period 1,408 1,071
Cash and cash equivalents, end of period $ 7,762 $ 1,408