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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities:    
Net loss $ (1,897,000) $ (405,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 20,000 19,000
Amortization of right of use lease asset 30,000 29,000
Unrealized loss (gain) on marketable equity securities 220,000 (584,000)
Employee stock option expense 104,000 287,000
Loss (gain) on sale of marketable equity securities 70,000 (50,000)
Property abandonment and impairment 17,000 0
Other income (10,000) (44,000)
Loss on derivative instruments 34,000 90,000
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (281,000) 60,000
Accounts payable and other current liabilities (30,000) (118,000)
Net cash used in operating activities (1,723,000) (716,000)
Investing activities:    
Sale of short-term investments, net 1,837,000 488,000
Purchase of mineral property (458,000) 0
Purchase of other assets - net (39,000) 0
Cash from sale of marketable equity securities 104,000 123,000
Sale (purchase) of derivative instruments - net 8,000 (121,000)
Net cash provided by investing activities 1,452,000 490,000
Financing activities:    
Issuance of common stock - net of acquisition costs 137,000 0
Stock options exercised for cash 83,000 0
Paycheck Protection Loan 0 70,000
Purchase of common stock for cancellation 0 (5,000)
Net cash provided by financing activities 220,000 65,000
Net decrease in cash and cash equivalents (51,000) (161,000)
Cash and cash equivalents, beginning of period 605,000 574,000
Cash and cash equivalents, end of period 554,000 413,000
Supplemental Cash Flow information:    
Accrued mineral property acquisition costs included in accounts payable 60,000 0
Acquisition of right to use asset 99,000 0
Conversion of SilverStream note to marketable equity securities $ 0 $ 294,000