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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating activities:    
Net loss $ (3,598) $ (942)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized loss on marketable equity securities 1,058
Gain on sale of marketable equity securities (578)
Gain on derivative instruments (271)
Employee stock option expense 660 50
Depreciation and amortization 25 13
Loss on sale of assets 1
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (50) 52
Accounts payable and other current liabilities 547 18
Net cash (used in) operating activities (1,357) (1,658)
Investing activities:    
Sale of short-term investments - net 1,371 3,563
Loan to Zazu (1,500)
Purchase of Zazu, net of cash acquired (417)
Purchase of marketable equity securities (578)
Proceeds from sale of marketable equity securities 666
Sale of derivative instrument, net 53
Additions to other assets (10) (2)
Net cash provided by investing activities 1,361 1,785
Financing activities:    
Repurchase of Solitario common stock for cancellation (101) (32)
Net cash used in financing activities (101) (32)
Net (decrease) increase in cash and cash equivalents (97) 95
Cash and cash equivalents, beginning of year 214 119
Cash and cash equivalents, end of year 117 214
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