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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income $ 148,000us-gaap_NetIncomeLoss $ 269,000us-gaap_NetIncomeLoss
Other comprehensive income (loss):    
Change in unrealized gain (loss) on marketable securities, net of tax of ($205,000) and $155,000 (328,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 442,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for gains included in net income, net of tax of $57,000    (104,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Total other comprehensive income (loss) (328,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax 338,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) $ (180,000)us-gaap_ComprehensiveIncomeNetOfTax $ 607,000us-gaap_ComprehensiveIncomeNetOfTax