Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$ 23,682	$ 22,407	$ 73,713	$ 69,667
Operating expenses:
Direct	9,769	9,452	30,871	29,196
Selling, general and administrative	5,805	6,019	18,154	18,903
Depreciation and amortization	949	907	2,810	2,788
Total operating expenses	16,523	16,378	51,835	50,887
Operating income	7,159	6,029	21,878	18,780
Other income (expense):
Interest income	22	14	58	45
Interest expense	(76)	(91)	(236)	(309)
Other, net	2	(4)	16	28
Total other expense	(52)	(81)	(162)	(236)
Income before income taxes	7,107	5,948	21,716	18,544
Provision for income taxes	2,555	2,135	7,659	6,827
Net income	$ 4,552	$ 3,813	$ 14,057	$ 11,717
Common Class A [Member]
Basic Earnings Per Share:
Basic earnings per share (in Dollars per share)	$ 0.11	$ 0.09	$ 0.34	$ 0.28
Diluted Earnings Per Share:
Diluted earnings per share (in Dollars per share)	$ 0.11	$ 0.09	$ 0.33	$ 0.28
Dividends Per Share of Common Stock:
Dividends per share (in Dollars per share)				$ 0.05
Weighted average shares and share equivalents outstanding:
Weighted average shares and share equivalents outstanding, basic (in Shares)	20,771	20,672	20,761	20,671
Weighted average shares and share equivalents outstanding, diluted (in Shares)	21,035	21,111	21,078	21,087
Common Class B [Member]
Basic Earnings Per Share:
Basic earnings per share (in Dollars per share)	$ 0.66	$ 0.55	$ 2.03	$ 1.70
Diluted Earnings Per Share:
Diluted earnings per share (in Dollars per share)	$ 0.64	$ 0.54	$ 1.99	$ 1.67
Dividends Per Share of Common Stock:
Dividends per share (in Dollars per share)				$ 0.31
Weighted average shares and share equivalents outstanding:
Weighted average shares and share equivalents outstanding, basic (in Shares)	3,474	3,445	3,472	3,445
Weighted average shares and share equivalents outstanding, diluted (in Shares)	3,536	3,514	3,538	3,513