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, 2014	6,043		668
Balance at Dec. 31, 2014	$ 30	$ 29,454	$ (10,082)	$ (6,566)		$ 12,836
Shares issued – vested (in shares)	40
Exercise of stock options (in shares)	8
Exercise of stock options		61				61
Tax withholding related to vested shares from employee stock plans		(227)				(227)
Stock compensation expense		674				674
Excess tax benefit from stock-based compensation plans		60				60
Cash dividends declared ($0.60 per share)				(3,241)		(3,241)
Net income				1,511		1,511
Other comprehensive loss
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
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 ($0.60 per share)				(3,267)		(3,267)
Net income				6,678		6,678
Shares issued – vested	$ 1	(1)
Other comprehensive loss
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
Exercise of stock options (in shares)						2
Exercise of stock options		35				$ 35
Tax withholding related to vested shares from employee stock plans		(198)				(198)
Stock compensation expense		582				582
Cash dividends declared ($0.60 per share)				(3,289)		(3,289)
Net income				6,121		6,121
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