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Retirement Plan (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Periodic Pension Cost [Line Items]      
Service cost $ 16 $ 0 $ 0
Interest cost 72 61 64
Expected return on plan assets (52) (54) (52)
Net amortization 99 59 74
Net periodic pension cost $ 135 $ 66 $ 86