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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating activities:    
Net loss $ (1,420) $ (2,205)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 12 16
Amortization of right of use lease asset 20 20
Unrealized (gain) loss on marketable equity securities (102) 155
Unrealized (gain) loss on short-term investments (35) 98
Employee stock option expense 126 26
Loss on sale of marketable equity securities 0 159
(Gain) loss on derivative instruments (23) 3
Changes in operating assets and liabilities:    
Prepaid expenses and other (328) 222
Accounts payable and other liabilities (15) 234
Net cash used in operating activities (1,765) (1,272)
Investing activities:    
Sale (purchase) of short-term investments, net 1,909 (881)
Purchase of mineral property 0 10
Purchase of other assets - net (9) (49)
Cash from sale of marketable equity securities 0 53
Sale of derivative instruments - net 31 0
Net cash provided (used in) by investing activities 1,931 (887)
Financing activities:    
Issuance of common stock - net of issuing costs 0 2,023
Stock options exercised for cash 14 20
Net cash provided by financing activities 14 2,043
Net increase (decrease) in cash and cash equivalents 180 (116)
Cash and cash equivalents, beginning of period 316 462
Cash and cash equivalents, end of period 496 346
Supplemental Cash Flow information:    
Acquisition of right to use asset $ 87 $ 0