Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ 67,655	$ 40,892	$ 66,668	$ 39,664
Net income	1,663	1,004	3,438	2,132
Treasury stock purchased	(1,200)	(292)	(2,191)	(384)
Stock-based compensation	79	65	205	176
Tax benefit - stock option exercises	55	0	55	0
Exercise of stock options	292	220	456	301
Balance at end of period	68,598	41,889	68,598	41,889
Unrealized Gain (Loss) on Investments	$ 54	$ 0	$ (33)	$ 0