Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2015	6,091		668
Balance at Dec. 31, 2015	$ 30	$ 30,022	$ (10,082)	$ (8,296)		$ 11,674
Shares issued – vested (in shares)	37
Shares issued – vested	$ 1	(1)
Tax withholding related to vested shares from employee stock plans		(202)				(202)
Stock compensation expense		671				671
Excess tax benefit from stock-based compensation plans		113		(60)		53
Cash dividends declared				(3,267)		(3,267)
Net income				6,678		6,678
Balance (in shares) at Dec. 31, 2016	6,128		668
Balance at Dec. 31, 2016	$ 31	30,603	$ (10,082)	(4,945)		15,607
Shares issued – vested (in shares)	32
Shares issued – vested
Tax withholding related to vested shares from employee stock plans		(198)				(198)
Stock compensation expense		582				582
Cash dividends declared				(3,289)		(3,289)
Net income				6,121		6,121
Exercise of stock options (in shares)
Exercise of stock options		35				35
Other comprehensive loss					$ (238)	(238)
Balance (in shares) at Dec. 31, 2017	6,160		668
Balance at Dec. 31, 2017	$ 31	31,022	$ (10,082)	(2,113)	(238)	18,620
Shares issued – vested (in shares)	15
Tax withholding related to vested shares from employee stock plans		(93)				(93)
Stock compensation expense		594				594
Cash dividends declared				(3,797)		(3,797)
Net income				4,584		$ 4,584
Exercise of stock options (in shares)
Other comprehensive loss					(1,161)	$ (1,161)
Balance (in shares) at Dec. 31, 2018	6,175		668
Balance at Dec. 31, 2018	$ 31	$ 31,523	$ (10,082)	$ (1,326)	$ (1,399)	$ 18,747