Stock Incentive Plans (Details 2) - Stock incentive and equity plans [Member]	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant, Beginning	274,494
Shares available for grant, Granted	(36,953)
Shares available for grant, Exercised/issued
Shares available for grant, Cancelled/forfeited	49,056
Shares available for grant, Ending	286,597
Number of options outstanding, Beginning	125,564
Number of options outstanding, Granted
Number of options outstanding, Exercised/issued
Number of options outstanding, Cancelled/forfeited	(46,073)
Number of options outstanding, Ending	79,491
Weighted-average option exercise price, Beginning | $ / shares	$ 19.53
Weighted-average option exercise price, Granted | $ / shares
Weighted-average option exercise price, Exercised/issued | $ / shares
Weighted-average option exercise price, Cancelled/forfeited | $ / shares	23.94
Weighted-average option exercise price, Ending | $ / shares	$ 21.84
Number of restricted stock and board shares issued, Beginning	97,692
Number of restricted stock and board shares issued, Granted	1,878
Number of restricted stock and board shares issued, Exercised/issued
Number of restricted stock and board shares issued, Cancelled/forfeited
Number of restricted stock and board shares issued, Ending	99,570
Number of restricted stock units outstanding, Beginning	22,384
Number of restricted stock units outstanding, Granted	35,075
Number of restricted stock units outstanding, Exercised/issued	(3,477)
Number of restricted stock units outstanding, Cancelled/forfeited	(2,983)
Number of restricted stock units outstanding, Ending	50,999