Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue	$ 26,030	$ 24,906
Operating expenses:
Direct	10,329	10,246
Selling, general and administrative	6,366	6,493
Depreciation and amortization	935	950
Total operating expenses	17,630	17,689
Operating income	8,400	7,217
Other income (expense):
Interest income	17	19
Interest expense	(81)	(117)
Other, net	7	14
Total other expense	(57)	(84)
Income before income taxes	8,343	7,133
Provision for income taxes	2,890	2,663
Net income	$ 5,453	$ 4,470
Common Class A [Member]
Basic Earnings Per Share:
Diluted earnings per share (in Dollars per share)	$ 0.13	$ 0.11
Basic earnings per share (in Dollars per share)	$ 0.13	$ 0.11
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)	20,742	20,669
Weighted average shares and share equivalents outstanding, diluted (in Shares)	21,134	21,063
Common Class B [Member]
Basic Earnings Per Share:
Diluted earnings per share (in Dollars per share)	$ 0.77	$ 0.64
Basic earnings per share (in Dollars per share)	$ 0.79	$ 0.65
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)	3,469	3,445
Weighted average shares and share equivalents outstanding, diluted (in Shares)	3,541	3,511