CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Comprehensive Loss [Member]	Total
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 income (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
Beginning balance at Jun. 30, 2018		$ 127	65,157	28,858	(101)	94,041
Balance (in shares) at Jun. 30, 2018		12,694,926
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				2,165		2,165
Stock-based compensation			56			56
Dividends paid on common stock				(381)		(381)
Exercise of stock options			3			3
Exercise of stock options (in shares)		875
Other comprehensive income (loss)					(5)	(5)
Ending balance at Sep. 30, 2018		$ 127	65,216	30,642	(106)	95,879
Balance (in shares) at Sep. 30, 2018		12,695,801
Beginning balance at Dec. 31, 2018		$ 128	65,538	32,860	(73)	98,453
Balance (in shares) at Dec. 31, 2018		12,759,576
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				7,166		7,166
Stock-based compensation			109			109
Dividends paid on common stock				(1,276)		(1,276)
Exercise of stock options			97			$ 97
Exercise of stock options (in shares)		17,961				17,961
Other comprehensive income (loss)					70	$ 70
Ending balance at Sep. 30, 2019		$ 128	65,744	38,750	(3)	104,619
Balance (in shares) at Sep. 30, 2019		12,777,537
Beginning balance at Jun. 30, 2019		$ 128	65,696	36,878	(11)	102,691
Balance (in shares) at Jun. 30, 2019		12,775,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				2,381		2,381
Stock-based compensation			32			32
Dividends paid on common stock				(509)		(509)
Exercise of stock options			16			16
Exercise of stock options (in shares)		2,400
Other comprehensive income (loss)					8	8
Ending balance at Sep. 30, 2019		$ 128	$ 65,744	$ 38,750	$ (3)	$ 104,619
Balance (in shares) at Sep. 30, 2019		12,777,537