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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating activities:    
Net loss $ (939) $ (3,289)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized (gain) loss on marketable equity securities (360) 711
Gain on sale of marketable equity securities (50) 0
Loss on derivative instruments 92 38
Other income - Paycheck Protection Program loan forgiveness (60) 0
Other income - gain on conversion of SilverStream note (44) 0
Mineral property impairment 6 0
Employee stock option expense 315 343
Depreciation 25 25
Amortization of right of use lease asset 38 37
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 95 216
Note receivable, net of mineral property sold 0 (223)
Accounts payable and other current liabilities (128) (497)
Net cash (used in) operating activities (1,010) (2,639)
Investing activities:    
Sale of short-term investments - net 974 3,338
Purchase of Vendetta units 0 (233)
Sale of marketable equity securities 123 0
(Purchase) sale of derivative instruments - net (121) 9
Additions to other assets 0 (5)
Net cash provided by investing activities 976 3,109
Financing activities:    
Paycheck Protection Program loan 70 0
Repurchase of Solitario common stock for cancellation (5) (13)
Net cash used in financing activities 65 (13)
Net increase in cash and cash equivalents 31 457
Cash and cash equivalents, beginning of year 574 117
Cash and cash equivalents, end of year 605 574
Supplemental Cash Flow information:    
Conversion of SilverStream note to marketable equity securities 294 0
Acquisition of Gold Coin property included in accounts payable $ 17 $ 0