Stock Incentive Plans (Details 3) - Non-vested Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Non-vested options
Non-vested, Beginning balance	148,983	125,196
Granted		94,362
Vested	(47,618)	(33,011)
Cancelled	(54,523)	(37,564)
Non-vested, Ending balance	46,842	148,983
Weighted-average option exercise price
Non-vested, Beginning balance	$ 10.20	$ 22.32
Granted		6.34
Vested	12.89	28.10
Cancelled	9.50	25.10
Non-vested, Ending balance	$ 8.26	$ 10.20