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Consolidated Statements of Comprehensive Income (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Net income $ 2,742,000us-gaap_NetIncomeLoss $ 2,079,000us-gaap_NetIncomeLoss
Other comprehensive income:    
Change in unrealized gain on marketable securities, net of tax 995,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 601,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for gains included in net income (245,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax  
Total other comprehensive income 750,000us-gaap_OtherComprehensiveIncomeLossNetOfTax 601,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 3,492,000us-gaap_ComprehensiveIncomeNetOfTax $ 2,680,000us-gaap_ComprehensiveIncomeNetOfTax