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Consolidated Statements of Operations (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]    
Joint venture property payments $ 200,000us-gaap_RoyaltyIncomeNonoperating $ 300,000us-gaap_RoyaltyIncomeNonoperating
Costs, expenses and other:    
Exploration expense 279,000us-gaap_ExplorationExpenseMining 797,000us-gaap_ExplorationExpenseMining
Depreciation and amortization 13,000us-gaap_DepreciationAndAmortization 26,000us-gaap_DepreciationAndAmortization
General and administrative 2,176,000us-gaap_GeneralAndAdministrativeExpense 2,244,000us-gaap_GeneralAndAdministrativeExpense
Gain on derivative instruments (39,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet (90,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
Property abandonment and impairment 20,000us-gaap_GainLossOnDispositionOfAssets 13,000us-gaap_GainLossOnDispositionOfAssets
Gain on sale of assets (1,000)us-gaap_GainsLossesOnSalesOfAssets (11,000)us-gaap_GainsLossesOnSalesOfAssets
Interest expense and dividend income (net) (1,000)us-gaap_InterestAndDividendIncomeSecuritiesOther (57,000)us-gaap_InterestAndDividendIncomeSecuritiesOther
Total costs, expenses and other 2,447,000us-gaap_OtherCostAndExpenseOperating 2,922,000us-gaap_OtherCostAndExpenseOperating
Other Income (expense)    
Gain on sale of marketable equity securities 472,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds 142,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Gain on warrant liability 85,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet 998,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Gain on early termination of debt    313,000us-gaap_GainsLossesOnExtinguishmentOfDebt
Equity in net loss of equity method investment (153,000)us-gaap_IncomeLossFromEquityMethodInvestments (1,012,000)us-gaap_IncomeLossFromEquityMethodInvestments
Total other income (expense) 404,000us-gaap_OtherIncome 441,000us-gaap_OtherIncome
Loss before income tax (1,843,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic (2,181,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Income tax benefit    176,000us-gaap_IncomeTaxExpenseBenefit
Net loss (1,843,000)us-gaap_NetIncomeLoss (2,005,000)us-gaap_NetIncomeLoss
(Income) loss attributable to noncontrolling interest 10,000us-gaap_IncomeLossAttributableToNoncontrollingInterest (47,000)us-gaap_IncomeLossAttributableToNoncontrollingInterest
Net loss attributable to Solitario shareholders $ (1,833,000)XPL_NetLossAttributableToSolitarioStockholders $ (2,052,000)XPL_NetLossAttributableToSolitarioStockholders
Loss per common share attributable to Solitario shareholders:    
Basic and diluted $ (0.05)us-gaap_EarningsPerShareBasicAndDiluted $ (0.06)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding:    
Basic and diluted 38,967us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 35,743us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted