Shareholders' Equity - Summary of common shareholders' equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Common stock	Capital in excess of par value	Retained earnings	ESOT	Treasury stock	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2013	$ 523	$ 14,024	$ 12,302	$ (1,065)	$ (2,024)	$ (26)	$ 23,734
Balance (shares) at Dec. 31, 2013	2,614,506						2,614,506
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss			(145)				(145)
Purchase of treasury shares					(156)		(156)
Stock based compensation		21			69		90
Balance at Mar. 31, 2014	$ 523	$ 14,045	$ 12,157	$ (1,065)	$ (2,111)	$ (26)	$ 23,523
Balance (shares) at Mar. 31, 2014	2,614,506						2,614,506