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Segment Reporting - Segment Reporting (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Consolidated 2014
Exploration expense	$ 279,000XPL_ExplorationExpenseMineralProperty / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2014Member
Interest expense
Other (income) loss	1,564,000us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2014Member
Pre-tax income (loss)	(1,843,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2014Member
Total assets	19,040,000us-gaap_PaymentsForProceedsFromProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2014Member
Capital Expenditures	2,915,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2014Member
Exploration 2014
Exploration expense	279,000XPL_ExplorationExpenseMineralProperty / us-gaap_ConsolidationItemsAxis = XPL_Exploration2014Member
Interest expense
Other (income) loss	50,000us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = XPL_Exploration2014Member
Pre-tax income (loss)	(329,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = XPL_Exploration2014Member
Total assets	57,000us-gaap_PaymentsForProceedsFromProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_Exploration2014Member
Capital Expenditures
Corporate and Other 2014
Interest expense
Other (income) loss	1,514,000us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = XPL_CorporateOther2014Member
Pre-tax income (loss)	(1,514,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = XPL_CorporateOther2014Member
Total assets	2,966,000us-gaap_PaymentsForProceedsFromProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_CorporateOther2014Member
Capital Expenditures
Mt. Hamilton 2014
Interest expense
Other (income) loss
Pre-tax income (loss)
Total assets	16,017,000us-gaap_PaymentsForProceedsFromProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_MtHamilton2014Member
Capital Expenditures	2,915,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_MtHamilton2014Member
Corporate and Other 2013
Interest expense
Other (income) loss		887,000us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = XPL_CorporateOther2013Member
Pre-tax income (loss)		(887,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = XPL_CorporateOther2013Member
Total assets		4,433,000us-gaap_PaymentsForProceedsFromProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_CorporateOther2013Member
Capital Expenditures		4,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_CorporateOther2013Member
Exploration 2013
Exploration expense		797,000XPL_ExplorationExpenseMineralProperty / us-gaap_ConsolidationItemsAxis = XPL_Exploration2013Member
Interest expense
Other (income) loss		784,000us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = XPL_Exploration2013Member
Pre-tax income (loss)		(1,581,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = XPL_Exploration2013Member
Total assets		784,000us-gaap_PaymentsForProceedsFromProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_Exploration2013Member
Capital Expenditures		5,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_Exploration2013Member
Consolidated 2013
Exploration expense		797,000XPL_ExplorationExpenseMineralProperty / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2013Member
Interest expense
Other (income) loss		1,384,000us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2013Member
Pre-tax income (loss)		(2,181,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2013Member
Total assets		19,500,000us-gaap_PaymentsForProceedsFromProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2013Member
Capital Expenditures		3,103,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_Consolidated2013Member
Mt. Hamilton 2013
Interest expense
Other (income) loss		(287,000)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = XPL_MtHamilton2013Member
Pre-tax income (loss)		287,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = XPL_MtHamilton2013Member
Total assets		14,283,000us-gaap_PaymentsForProceedsFromProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_MtHamilton2013Member
Capital Expenditures		$ 3,094,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_ConsolidationItemsAxis = XPL_MtHamilton2013Member

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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