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Intangible assets (Future Amortization) (Details) (USD $)
Dec. 31, 2014
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]  
2015 $ 128,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 127,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 116,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 115,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 115,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 372,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total $ 973,000us-gaap_OtherIntangibleAssetsNet