Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ 66,960	$ 40,193	$ 66,668	$ 39,664
Net income	1,045	650	1,775	1,128
Treasury stock purchased	(418)	(92)	(991)	(92)
Stock-based compensation	67	60	126	111
Exercise of stock options	88	81	164	81
Balance at end of period	67,655	40,892	67,655	40,892
Unrealized Gain (Loss) on Investments	$ (87)	$ 0	$ (87)	$ 0