Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Class A Common Stock	Class B Common Stock
Balance at Dec. 31, 2009	$ 64,093	$ 49,352	$ 43,064	$ (28,395)	$ 64	$ 8
Balance, shares at Dec. 31, 2009					6,360	799
Net income	15,136		15,136
Conversion of shares from Class B to Class A	0				1	(1)
Forfeiture of restricted stock, shares					(3)
Compensation expense related to restricted stock awards	360	360
Share-based compensation cost	567	567
Purchase of shares held in treasury	(78)			(78)
Balance at Dec. 31, 2010	80,078	50,279	58,200	(28,473)	64	8
Balance, shares at Dec. 31, 2010					6,358	798
Net income	12,631		12,631
Conversion of shares from Class B to Class A	0				1	(1)
Compensation expense related to restricted stock awards	187	187
Share-based compensation cost	196	196
Purchase of shares held in treasury	(117)			(117)
Balance at Dec. 31, 2011	92,975	50,662	70,831	(28,590)	64	8
Balance, shares at Dec. 31, 2011					6,359	797
Net income	17,925		17,925
Conversion of shares from Class B to Class A	0
Net proceeds from exercised options	267	267
Dividends declared per common share	(7,010)		(7,010)
Compensation expense related to restricted stock awards	110	110
Share-based compensation cost	22	22
Purchase of shares held in treasury	(80)			(80)
Balance at Dec. 31, 2012	$ 104,209	$ 51,061	$ 81,746	$ (28,670)	$ 64	$ 8
Balance, shares at Dec. 31, 2012					6,369	797