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Short-Term Borrowings (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Nov. 14, 2018
Sep. 30, 2018
Dec. 31, 2017
Short-term Debt [Line Items]      
Line of Credit Facility, Expiration Date   Nov. 04, 2018  
Line of Credit Facility, Interest Rate Description   (“LIBOR”) plus 0.75%  
Short-term Debt   $ 8,048 $ 0
Revolving Credit Facility [Member]      
Short-term Debt [Line Items]      
Line of Credit Facility, Amount, Total   $ 60,000  
Line of Credit Facility, Interest Rate During Period   3.00%  
Line of Credit Facility, Remaining Borrowing Capacity   $ 8,000  
Revolving Credit Facility [Member] | Subsequent Event [Member]      
Short-term Debt [Line Items]      
Line of Credit Facility, Description Subsequent to September 30, 2018, the line of credit agreement was renewed on the same terms for another one-year period, expiring November 5, 2019.