CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Comprehensive Loss [Member]	Total
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			2,609		2,609
Stock-based compensation		43			43
Dividends paid on common stock			(382)		(382)
Exercise of stock options		81			$ 81
Exercise of stock options (in shares)	15,511				15,511
Other comprehensive income (loss)				24	$ 24
Ending balance at Mar. 31, 2019	$ 128	65,662	35,087	(49)	100,828
Balance (in shares) at Mar. 31, 2019	12,775,087
Beginning balance at Dec. 31, 2019	$ 128	65,944	39,445	(45)	105,472
Balance (in shares) at Dec. 31, 2019	12,810,926
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			565		565
Stock-based compensation		34			34
Dividends paid on common stock			(513)		(513)
Exercise of stock options		14			$ 14
Exercise of stock options (in shares)	2,050				2,050
Other comprehensive income (loss)				149	$ 149
Ending balance at Mar. 31, 2020	$ 128	$ 65,992	$ 39,497	$ 104	$ 105,721
Balance (in shares) at Mar. 31, 2020	12,812,976