Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 31,480	$ 31,017
Operating expenses:
Direct, exclusive of depreciation and amortization	11,654	12,909
Selling, general and administrative, exclusive of depreciation and amortization	7,707	7,867
Depreciation and amortization	1,415	1,283
Total operating expenses	20,776	22,059
Operating income	10,704	8,958
Other income (expense):
Interest income	6	45
Interest expense	(570)	(8)
Other, net	(280)	(28)
Total other income (expense)	(844)	9
Income before income taxes	9,860	8,967
Provision for income taxes	1,664	1,661
Net income	$ 8,196	7,306
Denominator for net income per share - basic:
Basic earnings per share (in dollars per share)	$ 0.33
Numerator for net income per share - diluted:
Diluted earnings per share (in dollars per share)	0.32
Dividends Per Share of Common Stock:
Dividends declared per common share (in dollars per share)	$ 0.19
Weighted average shares and share equivalents outstanding:
Weighted average shares and share equivalents outstanding, basic (in shares)	24,766
Weighted average shares and share equivalents outstanding, diluted (in shares)	25,509
Common Class A [Member]
Other income (expense):
Net income		$ 3,630
Denominator for net income per share - basic:
Basic earnings per share (in dollars per share)		$ 0.17
Numerator for net income per share - diluted:
Diluted earnings per share (in dollars per share)		0.17
Dividends Per Share of Common Stock:
Dividends declared per common share (in dollars per share)		$ 0.10
Weighted average shares and share equivalents outstanding:
Weighted average shares and share equivalents outstanding, basic (in shares)		20,884
Weighted average shares and share equivalents outstanding, diluted (in shares)		21,837
Common Class B [Member]
Other income (expense):
Net income		$ 3,676
Denominator for net income per share - basic:
Basic earnings per share (in dollars per share)		$ 1.04
Numerator for net income per share - diluted:
Diluted earnings per share (in dollars per share)		1.01
Dividends Per Share of Common Stock:
Dividends declared per common share (in dollars per share)		$ 0.60
Weighted average shares and share equivalents outstanding:
Weighted average shares and share equivalents outstanding, basic (in shares)		3,527
Weighted average shares and share equivalents outstanding, diluted (in shares)		3,630