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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating activities:    
Net loss $ (942) $ (1,710)
Adjustments to reconcile net loss to net cash used in operating activities:    
(Gain) loss on asset and equity security sales (578) (26)
Gain on derivative instruments (271) (672)
Employee stock option expense 50 970
Depreciation and amortization 13 5
Property abandonment and impairment 13
Deferred income taxes (353)
Gain on warrant liability (4)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 52 (7)
Accounts payable and other current liabilities 18 (51)
Net cash (used in) operating activities (1,658) (1,835)
Investing activities:    
Sale (purchase) of short-term investments - net 3,563 (15,272)
Loan to Zazu (1,500)
Purchase of Zazu, net of cash acquired (417)
Purchase of marketable equity securities (578) (304)
Proceeds from sale of marketable equity securities 666 56
Sale of derivative instrument, net 53 45
Additions to other assets (2) (1)
Purchase of mineral property (40)
Net cash provided by (used in) investing activities 1,785 (15,516)
Financing activities:    
Repurchase of Solitario common stock for cancellation (32) (248)
Net (decrease) increase in cash and cash equivalents 95 (17,599)
Cash and cash equivalents, beginning of year 119 17,718
Cash and cash equivalents, end of year 214 119
Supplemental disclosure of non-cash activities:    
Additions to mining equipment –Zazu through issuance of stock in Acquisition (100)
Additions to mineral property- Zazu through issuance of stock in Acquisition (15,611)
Additions to current assets, net – Zazu through issuance of stock in Acquisition (42)
Issuance of common stock – Zazu acquisition 13,654
Convertible debenture – due from Zazu cancelled 1,510
Asset retirement obligation - Lik 125
Issuance of replacement options – Zazu 164
Transfer of warrant value to marketable equity securities on exercise of Vendetta Warrants $ 949