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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating activities:    
Net loss $ (3,928) $ (2,367)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized loss (gain) on marketable equity securities 94 (82)
Unrealized loss on short-term investments 108 102
Loss on sale of marketable equity securities (201) 248
Loss on derivative instruments 4 38
Other income - Paycheck Protection Program loan forgiveness 0 (10)
Mineral property impairment 0 17
Employee stock option expense 338 124
Depreciation 29 27
Amortization of right of use lease asset 40 40
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 265 (277)
Accounts payable and other current liabilities (51) (17)
Net cash used in operating activities (2,900) (2,157)
Investing activities:    
Sale of short-term investments - net 1,028 609
Additions to mineral property (340) (635)
Sale of marketable equity securities 63 147
Sale of derivative instruments - net 0 8
Additions to other assets (50) (39)
Net cash provided by investing activities 701 90
Financing activities:    
Issuance of common stock - net of issuance costs 2,023 1,841
Stock options exercised for cash 30 83
Net cash provided by financing activities 2,053 1,924
Net decrease in cash and cash equivalents (146) (143)
Cash and cash equivalents, beginning of year 462 605
Cash and cash equivalents, end of year 316 462
Supplemental Cash Flow information:    
Accrued mineral property acquisition costs included in accounts payable 0 60
Acquisition of right to use asset $ 0 $ 99