Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefit Plans [Line Items]
Administrative expense	$ 1,700	$ 1,200	$ 2,300
Discretionary contribution	255,000	275,000	250,000
Deferred Compensation Expense Non Qualified Plan	$ 211,000	$ 184,000	$ 138,000