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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities:    
Net loss $ (1,196,000) $ (352,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 12,000 13,000
Amortization of right of use lease asset 20,000 20,000
Unrealized loss (gain) on marketable equity securities (270,000) 251,000
Employee stock option expense 72,000 215,000
Gain on sale of marketable equity securities 19,000 25,000
Other income 10,000 44,000
Loss on derivative instruments (33,000) (20,000)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 61,000 8,000
Accounts payable and other current liabilities 27,000 (125,000)
Net cash used in operating activities (730,000) (521,000)
Investing activities:    
Sale of short-term investments, net 493,000 162,000
Purchase of mineral property (201,000) 0
Purchase of other assets - net (39,000) 0
Cash from sale of marketable equity securities 88,000 76,000
Sale (purchase) of derivative instruments - net 8,000 14,000
Net cash provided by investing activities 349,000 252,000
Financing activities:    
Issuance of common stock - net of acquisition costs 98,000 0
Stock options exercised for cash 83,000 0
Paycheck Protection Loan 0 70,000
Purchase of common stock for cancellation 0 (4,000)
Net cash provided by financing activities 181,000 66,000
Net decrease in cash and cash equivalents (200,000) (203,000)
Cash and cash equivalents, beginning of period 605,000 574,000
Cash and cash equivalents, end of period 405,000 371,000
Supplemental Cash Flow information:    
Accrued mineral property acquisition costs included in accounts payable 173,000  
Accrued common stock acquisition costs included in accounts payable 65,000 0
Acquisition of right to use asset 99,000 0
Conversion of SilverStream note to marketable equity securities $ 0 $ 294,000