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 [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				925		925
Stock-based compensation			53			53
Dividend declared				(70)		(70)
Exercise of stock options			17			$ 17
Exercise of stock options (in shares)		5,025				5,025
Other comprehensive loss					$ (15)	$ (15)
Ending balance at Mar. 31, 2017	$ 4	$ 121	64,541	24,189	(15)	88,840
Balance (in shares) at Mar. 31, 2017	437,500	12,128,204
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				1,885		1,885
Stock-based compensation			56			56
Dividend declared				(70)		(70)
Dividends paid on common stock				(367)		(367)
Exercise of stock options			56			$ 56
Exercise of stock options (in shares)		14,202				14,202
Other			(189)			$ (189)
Other comprehensive loss					(54)	(54)
Ending balance at Mar. 31, 2018	$ 4	$ 122	$ 65,060	$ 27,320	$ (89)	$ 92,417
Balance (in shares) at Mar. 31, 2018	437,500	12,247,626