Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Beginning balance at Dec. 31, 2012	$ 53,896	$ 70	$ 913	$ 23	$ 52,890
Beginning balance, shares at Dec. 31, 2012		7,017
Common stock issued on exercise of options, Shares		90
Common stock issued on exercise of options	1,200	1	1,199	0	0
Share based compensation expense, net of tax, Shares		0
Share based compensation expense, net of tax	367	0	367	0	0
Excess tax benefits from share-based compensation	1,187	0	1,187	0	0
Cash dividends on common stock	(1,834)	0	0	0	(1,834)
Unrealized holding losses on marketable securities, net of tax	(47)	0	0	(47)
Net income	3,337	0	0	0	3,337
Ending balance at Jun. 30, 2013	58,106	71	3,666	(24)	54,393
Ending balance, shares at Jun. 30, 2013		7,107
Beginning balance at Dec. 31, 2013	72,553	72	5,781	(26)	66,726
Beginning balance, shares at Dec. 31, 2013		7,165
Common stock issued on exercise of options, Shares		17
Common stock issued on exercise of options	213	0	213	0	0
Share based compensation expense, net of tax, Shares		0
Share based compensation expense, net of tax	671	0	671	0	0
Excess tax benefits from share-based compensation	124	0	124	0	0
Company repurchase of common stock	(991)	0	(991)	0	0
Company repurchase of common stock, shares		(20)
Cash dividends on common stock	(2,582)	0	0	0	(2,582)
Unrealized holding losses on marketable securities, net of tax	(24)	0	0	(24)	0
Net income	3,700	0	0	0	3,700
Ending balance at Jun. 30, 2014	$ 73,664	$ 72	$ 5,798	$ (50)	$ 67,844
Ending balance, shares at Jun. 30, 2014		7,162