Stock-Based Compensation (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Number of Shares, Balance available, beginning of period	541,319	614,500
Number of Shares, Deferred under non-employee director's deferral program	0	(5,643)
Number of Shares, Balance available, end of period	395,319	541,319
Weighted Average Fair Value at Grant Date, Balance available, beginning of period	$ 0	$ 0
Weighted Average Fair Value at Grant Date, Deferred under non-employee director's deferral program	0	6.88
Weighted Average Fair Value at Grant Date, Balance available, end of period	$ 0	$ 0
Director [Member]
Number of Shares, Granted	0	(18,938)
Weighted Average Fair Value at Grant Date, Granted	$ 0	$ 6.88
Employees [Member]
Number of Shares, Granted	(146,000)	(48,600)
Weighted Average Fair Value at Grant Date, Granted	$ 6.95	$ 7.34