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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 329us-gaap_CashAndCashEquivalentsAtCarryingValue $ 869us-gaap_CashAndCashEquivalentsAtCarryingValue
Investments in marketable equity securities, at fair value 1,710us-gaap_AvailableForSaleSecuritiesCurrent 2,308us-gaap_AvailableForSaleSecuritiesCurrent
Prepaid expenses and other 32us-gaap_PrepaidExpenseAndOtherAssetsCurrent 40us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 2,071us-gaap_AssetsCurrent 3,217us-gaap_AssetsCurrent
Mineral properties 14,987us-gaap_MineralPropertiesNet 14,660us-gaap_MineralPropertiesNet
Other assets 1,108us-gaap_OtherAssetsNoncurrent 1,163us-gaap_OtherAssetsNoncurrent
Total assets 18,166us-gaap_Assets 19,040us-gaap_Assets
Current liabilities:    
Accounts payable 354us-gaap_AccountsPayableCurrent 343us-gaap_AccountsPayableCurrent
Current portion long-term debt, net of discount 4,915us-gaap_LongTermDebtCurrent 4,861us-gaap_LongTermDebtCurrent
Other 2us-gaap_OtherLiabilitiesCurrent   
Total current liabilities 5,271us-gaap_LiabilitiesCurrent 5,204us-gaap_LiabilitiesCurrent
Deferred gain on sale of mineral property 7,000us-gaap_DeferredGainOnSaleOfProperty 7,000us-gaap_DeferredGainOnSaleOfProperty
Warrant liability 6us-gaap_DerivativeLiabilities 55us-gaap_DerivativeLiabilities
Preferred stock, $0.01 par value, authorized 10,000,000 shares (none issued and outstanding at March 31, 2015 and December 31, 2014)      
Common stock, $0.01 par value, authorized 100,000,000 shares (39,247,689 shares issued and outstanding at March 31, 2015 and December 31, 2014) 393us-gaap_CommonStockValue 393us-gaap_CommonStockValue
Additional paid-in capital 54,669us-gaap_AdditionalPaidInCapital 54,512us-gaap_AdditionalPaidInCapital
Accumulated deficit (47,013)us-gaap_RetainedEarningsAccumulatedDeficit (46,563)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (1,718)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (1,120)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total Solitario shareholders’ equity 6,331us-gaap_StockholdersEquity 7,222us-gaap_StockholdersEquity
Noncontrolling interest (442)us-gaap_MinorityInterest (441)us-gaap_MinorityInterest
Total shareholders’ equity 5,889us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 6,781us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and shareholders’ equity $ 18,166us-gaap_LiabilitiesAndStockholdersEquity $ 19,040us-gaap_LiabilitiesAndStockholdersEquity