Stock-Based Compensation (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Number of Shares, Balance available, beginning of period	614,500	770,000
Number of Shares, Deferred under non-employee director's deferral program	(5,643)	0
Number of Shares, Balance available, end of period	581,319	614,500
Weighted Average Fair Value at Grant Date, Deferred under non-employee director's deferral program	$ 6.88
Employees [Member]
Number of Shares, Granted	(8,600)	(105,500)
Weighted Average Fair Value at Grant Date, Granted	$ 9.13	$ 5.29
Director [Member]
Number of Shares, Granted	(18,938)	(50,000)
Weighted Average Fair Value at Grant Date, Granted	$ 6.88	$ 9.85