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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue $ 30,013 $ 28,951 $ 89,047 $ 87,661
Operating expenses:        
Direct 11,780 12,267 35,685 36,706
Selling, general and administrative 7,679 8,430 23,486 22,021
Depreciation and amortization 1,388 1,132 3,996 3,376
Total operating expenses 20,847 21,829 63,167 62,103
Operating income 9,166 7,122 25,880 25,558
Other income (expense):        
Interest income 3 29 57 58
Interest expense (544) (18) (990) (68)
Other, net (242) 40 222 76
Total other (expense) income (783) 51 (711) 66
Income before income taxes 8,383 7,173 25,169 25,624
Provision for income taxes 1,391 3,020 2,923 9,198
Net income 6,992 4,153 22,246 16,426
Common Class A [Member]        
Other income (expense):        
Net income $ 6,992 $ 2,062 $ 17,622 $ 8,151
Denominator for net income per share - basic:        
Basic earnings per share (in dollars per share) $ 0.28 $ 0.10 $ 0.76 $ 0.39
Numerator for net income per share - diluted:        
Diluted earnings per share (in dollars per share) 0.27 0.09 0.73 0.38
Dividends Per Share of Common Stock:        
Dividends declared per common share (in dollars per share) $ 0.17 $ 0.10 $ 0.44 $ 0.30
Weighted average shares and share equivalents outstanding:        
Weighted average shares and share equivalents outstanding, basic (in shares) 24,671 20,788 23,184 20,759
Weighted average shares and share equivalents outstanding, diluted (in shares) 25,526 21,740 24,083 21,537
Common Class B [Member]        
Other income (expense):        
Net income $ 2,091 $ 4,624 $ 8,275
Denominator for net income per share - basic:        
Basic earnings per share (in dollars per share) $ 0.59 $ 1.31 $ 2.34
Numerator for net income per share - diluted:        
Diluted earnings per share (in dollars per share) 0.57 1.27 2.28
Dividends Per Share of Common Stock:        
Dividends declared per common share (in dollars per share) $ 0.60 $ 0.60 $ 1.80
Weighted average shares and share equivalents outstanding:        
Weighted average shares and share equivalents outstanding, basic (in shares) 3,514 3,527 3,514
Weighted average shares and share equivalents outstanding, diluted (in shares) 3,620 3,628 3,595