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Line of Credit (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Line of Credit  
Line of credit, available borrowing capacity $ 7,500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of credit, interest rate description 30-day LIBOR
Line of credit, basis spread on variable rate 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Line of credit, interest rate percentage 2.18%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Line of credit outstanding amount $ 0us-gaap_LineOfCredit