CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Comprehensive (Loss) Income [Member]	Total
Beginning balance at Dec. 31, 2016	$ 4	$ 121	$ 64,471	$ 23,334		$ 87,930
Balance (in shares) at Dec. 31, 2016	437,500	12,123,179
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				3,166		3,166
Stock-based compensation			146			146
Stock issued in acquisition		$ 1	774			775
Stock issued in purchase transaction (in shares)		108,084
Dividend declared				(210)		(210)
Exercise of stock options			207			$ 207
Exercise of stock options (in shares)		14,162				5,025
Other comprehensive loss					$ (4)	$ (4)
Ending balance at Sep. 30, 2017	$ 4	$ 122	65,598	26,290	(4)	92,010
Balance (in shares) at Sep. 30, 2017	437,500	12,245,425
Beginning balance at Dec. 31, 2017	$ 4	$ 122	65,137	25,872	(35)	91,100
Balance (in shares) at Dec. 31, 2017	437,500	12,233,424
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				5,968		5,968
Stock-based compensation			169			169
Redemption of preferred stock	$ (4)	$ 4
Redemption of preferred stock (in shares)	(437,500)	437,500
Dividend declared				(70)		(70)
Dividends paid on common stock				(1,128)		(1,128)
Exercise of stock options		$ 1	99			$ 100
Exercise of stock options (in shares)		24,877				24,877
Other			(189)			$ (189)
Other comprehensive loss					(71)	(71)
Ending balance at Sep. 30, 2018		$ 127	$ 65,216	$ 30,642	$ (106)	$ 95,879
Balance (in shares) at Sep. 30, 2018		12,695,801