Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock	Preferred stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Retained Earnings	Nonvested restricted stock
Balance at Dec. 31, 2015	$ 94,240	$ 63		$ 70,037	$ (4)	$ 24,504	$ (360)
Balance, shares at Dec. 31, 2015		6,289,038
Net income	13,036					13,036
Proceeds from exercise of stock options	1,098	$ 2		1,096
Proceeds from exercise of stock options, shares		152,751
Issuance of restricted stock				526			(526)
Issuance of restricted stock, shares		22,000
Compensation expense related to restricted stock, net of tax	469			183			286
Compensation expense related to stock options, net of tax	1,529			1,529
Other comprehensive income/ loss	(500)				(500)
Balance at Dec. 31, 2016	109,872	$ 65		73,371	(504)	37,540	(600)
Balance, shares at Dec. 31, 2016		6,463,789
Net income	13,045					13,045
Net issuance of common stock	24,758	$ 8		24,750
Net issuance of common stock, shares		805,000
Proceeds from exercise of stock options	705			705
Proceeds from exercise of stock options, shares		74,437
Issuance of restricted stock				201			(201)
Issuance of restricted stock, shares		4,625
Compensation expense related to restricted stock, net of tax	299						299
Compensation expense related to stock options, net of tax	959			959
Other comprehensive income/ loss	48				48
Balance at Dec. 31, 2017	149,686	$ 73		99,986	(456)	50,585	(502)
Balance, shares at Dec. 31, 2017		7,347,851
Net income	22,289					22,289
Proceeds from exercise of stock options	900	$ 2		898
Proceeds from exercise of stock options, shares		105,630
Issuance of restricted stock				558			(558)
Issuance of restricted stock, shares		13,000
Compensation expense related to restricted stock, net of tax	319						319
Compensation expense related to stock options, net of tax	1,183			1,183
Other comprehensive income/ loss	(461)				(461)
Balance at Dec. 31, 2018	$ 173,916	$ 75		$ 102,625	$ (917)	$ 72,874	$ (741)
Balance, shares at Dec. 31, 2018		7,466,481