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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating activities:    
Net loss $ (3,289) $ (3,598)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized loss on marketable equity securities 711 1,058
Loss on derivative instruments 38 0
Employee stock option expense 343 660
Depreciation 25 25
Amortization of right of use lease asset 37 0
Loss on sale of assets 0 1
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 216 (50)
Note receivable, net of mineral property sold (223) 0
Accounts payable and other current liabilities (497) 547
Net cash (used in) operating activities (2,639) (1,357)
Investing activities:    
Sale of short-term investments, net 3,338 1,371
Purchase of Vendetta units (233) 0
Sale of Kinross calls 9 0
Additions to other assets (5) (10)
Net cash provided by investing activities 3,109 1,361
Financing activities:    
Repurchase of Solitario common stock for cancellation (13) (101)
Net cash used in financing activities (13) (101)
Net (decrease) increase in cash and cash equivalents 457 (97)
Cash and cash equivalents, beginning of period 117 214
Cash and cash equivalents, end of period $ 574 $ 117