CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital in excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance (in shares) at Dec. 31, 2015		17,352,000				(1,708,000)
Balance at Dec. 31, 2015	$ 68,060	$ 347	$ 45,753	$ 30,574	$ (2,778)	$ (5,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	1,783			1,783
Issuance of common stock upon the exercise of stock options (in shares)		5,000
Issuance of common stock upon the exercise of stock options	27	$ 1	26
Net issuance of restricted stock awards (in shares)		122,000
Net issuance of restricted stock awards	2	$ 2
Equity based compensation	469		469
Stock options and awards tax benefits	(45)		(45)
Foreign currency translation adjustments	$ (716)				(716)
Balance (in shares) at Dec. 31, 2016	15,771,345	17,479,000				(1,708,000)
Balance at Dec. 31, 2016	$ 69,580	$ 350	46,203	32,357	(3,494)	$ (5,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of accounting standard	(578)			(578)
Net (loss) income	$ (3,386)			(3,386)
Issuance of common stock upon the exercise of stock options (in shares)	271,000	271,000
Issuance of common stock upon the exercise of stock options	$ 1,500	$ 5	1,495
Repurchase of common stock (in shares)		(54,000)
Repurchase of common stock	(1)	$ (1)
Net issuance of restricted stock awards (in shares)		(19,000)
Net issuance of restricted stock awards	0	$ 0
Equity based compensation	651		651
Foreign currency translation adjustments	$ 64				64
Balance (in shares) at Dec. 31, 2017	15,969,052	17,677,000				(1,708,000)
Balance at Dec. 31, 2017	$ 68,986	$ 354	$ 48,349	$ 29,549	$ (3,430)	$ (5,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of accounting standard	$ 578