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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Operating activities:    
Net income (loss) $ (1,710) $ 8,869
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Gain on derivative instruments (672) (84)
Depreciation and amortization 5 11
Property abandonment and impairment 13
Employee stock option expense 970 566
Deferred income taxes (353) 560
Gain on warrant liability (4) (51)
(Gain) loss on asset and equity security sales (26) 962
(Gain) on sale of discontinued operations (12,309)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (7) (53)
Accounts payable and other current liabilities (51) (4)
Net cash (used in) operating activities from continuing operations (1,835) (1,533)
Net cash (used in ) operating activities from discontinued operations (190)
Net cash (used in) operating activities (1,835) (1,723)
Investing activities:    
Purchase of short-term investments (net) (15,272)
Purchase of mineral property (40)
Purchase of marketable equity securities (304)
Proceeds from sale of marketable equity securities 56 809
Sale of derivative instrument, net 45 84
Additions to other assets (1) (8)
Proceeds from sale of MH-LLC 24,000
Proceeds from sale of other assets 7
Net cash provided by (used in) investing activities from continuing operations (15,516) 24,892
Net cash (used in) investing activities from discontinued operations (1,059)
Net cash provided by (used in) investing activities (15,516) 23,833
Financing activities:    
Repurchase of Solitario common stock for cancellation (248) (67)
Repayment of long-term debt (5,000)
Noncontrolling interest contribution, net 188
Net cash used in financing activities (248) (4,879)
Net (decrease) increase in cash and cash equivalents (17,599) 17,231
Cash and cash equivalents, beginning of year 17,718 487
Cash and cash equivalents, end of year 119 17,718
Supplemental disclosure of cash flow information:    
Cash paid for interest, capitalized to mineral property 228
Capitalized non-cash interest 265
Capitalized depreciation 7
Issuance of stock for mineral property $ 51