Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $)	Common Class A [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total
Balance at December 31, 2012 at Dec. 31, 2012	$ 420,000	$ 62,521,000	$ 16,166,000	$ (1,977,000)	$ (34,100,000)	$ 43,030,000
Balance at December 31, 2012 (in Shares) at Dec. 31, 2012	41,964,905			457,030
Stock issued upon exercise of stock options	3,000	1,540,000				1,543,000
Stock issued upon exercise of stock options (in Shares)	421,595
Employee stock option expense		1,376,000				1,376,000
Stock issued under employee stock purchase plan		17,000				17,000
Stock issued under employee stock purchase plan (in Shares)	2,846
Foreign currency translation			(387,000)			(387,000)
Unrealized loss on investments, net of tax effect			(16,000)			(16,000)
Windfall tax benefit from stock-based compensation		304,000				304,000
Treasury stock, at cost				(336,000)		(336,000)
Treasury stock, at cost (in Shares)				67,762
Net income					4,266,000	4,266,000
Balance at September 30, 2013 at Sep. 30, 2013	$ 423,000	$ 65,758,000	$ 15,763,000	$ (2,313,000)	$ (29,834,000)	$ 49,797,000
Balance at September 30, 2013 (in Shares) at Sep. 30, 2013	42,389,346			524,792