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Other Intangible Assets, Other than Goodwill (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Amortization $ 991 $ 991 $ 852
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 991    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 603    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 214    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 214    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 145