Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue	$ 26,270	$ 26,030
Operating expenses:
Direct	11,799	10,329
Selling, general and administrative	7,627	6,366
Depreciation and amortization	1,015	935
Total operating expenses	20,441	17,630
Operating income	5,829	8,400
Other income (expense):
Interest income	17	17
Interest expense	(63)	(81)
Other, net	(1)	7
Total other expense	(47)	(57)
Income before income taxes	5,782	8,343
Provision for income taxes	2,302	2,890
Net income	3,480	5,453
Common Class A [Member]
Other income (expense):
Net income	1,738	2,722
Basic Earnings Per Share:
Basic Earnings Per Share (in dollars per share)	$ 0.08	$ 0.13
Numerator for net income per share - diluted:
Diluted Earnings Per Share (in dollars per share)	$ 0.08	$ 0.13
Dividends Per Share of Common Stock:
Dividends Per Share of Common Stock (in dollars per share)	$ 0.06
Weighted average shares and share equivalents outstanding:
Weighted average shares and share equivalents outstanding - basic (in shares)	20,792	20,742
Denominator for diluted earnings per share – adjusted weighted average shares (in shares)	21,033	21,134
Common Class B [Member]
Other income (expense):
Net income	$ 1,742	$ 2,731
Basic Earnings Per Share:
Basic Earnings Per Share (in dollars per share)	$ 0.50	$ 0.79
Numerator for net income per share - diluted:
Diluted Earnings Per Share (in dollars per share)	$ 0.49	$ 0.77
Dividends Per Share of Common Stock:
Dividends Per Share of Common Stock (in dollars per share)	$ 0.36
Weighted average shares and share equivalents outstanding:
Weighted average shares and share equivalents outstanding - basic (in shares)	3,478	3,469
Denominator for diluted earnings per share – adjusted weighted average shares (in shares)	3,524	3,541