Stockholders' Equity (Details) (USD $)	3 Months Ended				3 Months Ended	0 Months Ended	3 Months Ended				3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Jul. 28, 2004	Mar. 31, 2013 Restricted stock	Apr. 29, 2013 Secured credit facility	Mar. 31, 2013 Secured credit facility	Mar. 31, 2013 Common stock	Mar. 31, 2013 Class A common stock	Dec. 31, 2012 Class A common stock	Mar. 31, 2013 Additional Paid-in Capital	Mar. 31, 2013 Accumulated Deficit	Mar. 31, 2013 Accumulated Other Comprehensive Loss
Changes in the components of stockholders equity
Balance at the beginning of the period	$ 48,093,000							$ 1,836,000	$ 1,851,000	$ 1,851,000	$ 102,166,000	$ (55,256,000)	$ (2,504,000)
Net loss	(2,279,000)	(2,623,000)										(2,279,000)
Issuance of restricted stock awards, net of forfeitures								15,000			(15,000)
Stock-based compensation											98,000
Repurchase and retirement of common stock								(3,000)			(58,000)
Unrealized gain on available-for-sale securities, net of income tax expense of $12	17,000	23,000											17,000
Change in net actuarial loss and prior service cost, net of income tax expense of $10	(14,000)	(12,000)											14,000
Balance at the end of the period	45,882,000							1,848,000	1,851,000	1,851,000	102,191,000	(57,535,000)	(2,473,000)
Income tax expense on unrealized gain on available-for-sale securities	12
Income tax expense on change in net actuarial loss and prior service cost	10
Maximum amount allowed to pay dividends and repurchase shares of common stock under modified debt agreement							2,500,000
Amount allowed to pay dividends and repurchase shares of common stock under the modified debt agreement, restrictions removed						2,500,000
Vesting rights percentage each year beginning on the second anniversary date of the grant					20.00%
Service period over which the aggregate market value of stock is being amortized					6 years
Accumulated other comprehensive loss, net of income taxes
Net actuarial loss and prior service cost not yet recognized in net periodic benefit cost, net of income tax benefit	(2,509,000)		(2,523,000)
Accumulated unrealized gain on available-for-sale securities, net of income tax expense	36,000		19,000
Accumulated other comprehensive loss	(2,473,000)		(2,504,000)
Income tax benefit on net actuarial loss and prior service cost not yet recognized in net periodic benefit cost	1,722,000		1,732,000
Income tax expense on accumulated unrealized gain on available-for-sale securities	$ 27,000		$ 15,000
Number of shares of common stock authorized to be repurchased				2,000,000
Number of shares repurchased	0	0
Remaining number of shares authorized to be repurchased	1,634,607
Maximum number of shares authorized for grant	1,500,000
Number of shares available for grant	381,774
Number of shares purchased and retired	33,950	23,779
Average purchase price of shares purchased and retired (in dollars per share)	$ 1.80	$ 1.16