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Short-Term Borrowings (Details Textual)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
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%
Revolving Credit Facility [Member]  
Short-term Debt [Line Items]  
Line of Credit Facility, Amount, Total $ 60