Consolidated Statement of Shareholders' Equity (USD $) In Thousands	Total	Capital in Excess of Par Value [Member]	Accumulated deficit [Member]	Accumulated other comprehensive loss [Member]	Class A Treasury Stock [Member]	Class A Common Stock [Member] Common Stock [Member]	Class B Common Stock [Member] Common Stock [Member]
Balance at Dec. 31, 2012	$ 95,516	$ 340,586	$ (244,529)	$ (438)	$ (775)	$ 412	$ 260
Balance, shares at Dec. 31, 2012					(59)	41,161	25,985
Net loss	(4,453)		(4,453)
Other comprehensive income	73			73
Issuance of shares of stock in conjunction with stock option exercises	27	27
Issuance of shares of stock in conjunction with stock option exercises, shares						15
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings	(402)	(405)				3
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings, shares						301
Non-cash equity compensation	937	937
Balance at Jun. 30, 2013	$ 91,698	$ 341,145	$ (248,982)	$ (365)	$ (775)	$ 415	$ 260
Balance, shares at Jun. 30, 2013					(59)	41,477	25,985