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 income			302				302
Purchase of treasury shares					(189)		(189)
Stock based compensation					159		180
Balance at Jun. 30, 2014	$ 523	$ 14,045	$ 12,604	$ (1,065)	$ (2,054)	$ (26)	$ 24,027
Balance (shares) at Jun. 30, 2014	2,614,506						2,614,506