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Marketable Equity Securities - Changes in Marketable Securities (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Marketable Securities [Abstract]    
Gross cash proceeds $ 556,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity $ 839,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Cost 84,000XPL_CostMarketableSecurities 697,000XPL_CostMarketableSecurities
Deferred taxes on gross gain on sale included in earnings    (58,000)us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss
Gross unrealized holding loss arising during the period included in other comprehensive loss. (1,108,000)us-gaap_AvailableForSaleEquitySecuritiesGrossUnrealizedLoss (4,081,000)us-gaap_AvailableForSaleEquitySecuritiesGrossUnrealizedLoss
Deferred taxes on unrealized holdings loss included in other comprehensive loss 384,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax 1,582,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Valuation allowance on deferred taxes on unrealized holding losses included in other comprehensive loss (384,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (871,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Other comprehensive income (loss) from marketable equity securities $ (1,580,000)us-gaap_MarketableSecuritiesGainLoss $ (3,454,000)us-gaap_MarketableSecuritiesGainLoss