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
Beginning balance at Dec. 31, 2008	$ 65,097	$ 51,951	$ 45,645	$ (32,552)	$ 47	$ 6
Beginning balance, shares at Dec. 31, 2008					4,770	600
Net income (loss)	(2,581)		(2,581)
Conversion of shares from Class B to Class A					1	(1)
Net proceeds from exercised options, shares					2
Net proceeds from exercised options	41	41
Forfeiture of restricted stock, shares					(2)
Compensation expense related to restricted stock awards	508	508
Share-based compensation cost	858	858
Purchase of shares held in treasury	(20)			(20)
401(k) plan contribution	190	(3,981)		4,171
Employee stock purchase plan		(6)		6
Ending balance at Dec. 31, 2009	64,093	49,371	43,064	(28,395)	47	6
Ending balance, shares at Dec. 31, 2009					4,771	599
Net income (loss)	15,136		15,136
Conversion of shares from Class B to Class A					1	(1)
Forfeiture of restricted stock, shares					(2)
Compensation expense related to restricted stock awards	360	360
Share-based compensation cost	567	567
Purchase of shares held in treasury	(78)			(78)
Ending balance at Dec. 31, 2010	80,078	50,298	58,200	(28,473)	47	6
Ending balance, shares at Dec. 31, 2010					4,770	598
Net income (loss)	12,631		12,631
Conversion of shares from Class B to Class A					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)
Ending balance at Dec. 31, 2011	$ 92,975	$ 50,681	$ 70,831	$ (28,590)	$ 47	$ 6
Ending balance, shares at Dec. 31, 2011					4,771	597