Stockholders' Equity (Details) (USD $)	12 Months Ended				0 Months Ended	12 Months Ended							0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jul. 28, 2004	Oct. 02, 2012 Secured credit facility	Dec. 31, 2012 Common stock item	Dec. 31, 2011 Common stock	Dec. 31, 2010 Common stock	Dec. 31, 2012 Class A common stock item	Dec. 31, 2011 Class A common stock	Dec. 31, 2010 Class A common stock	Dec. 31, 2009 Class A common stock	Oct. 02, 2012 Additional Paid-in Capital	Dec. 31, 2012 Additional Paid-in Capital	Dec. 31, 2011 Additional Paid-in Capital	Dec. 31, 2010 Additional Paid-in Capital	Dec. 31, 2012 Accumulated Deficit	Dec. 31, 2011 Accumulated Deficit	Dec. 31, 2010 Accumulated Deficit	Dec. 31, 2012 Accumulated Other Comprehensive Loss	Dec. 31, 2011 Accumulated Other Comprehensive Loss	Dec. 31, 2010 Accumulated Other Comprehensive Loss
Changes in the components of stockholders equity
Balance at the beginning of the period	$ 44,949,000					$ 1,828,000	$ 1,820,000	$ 1,806,000	$ 1,851,000	$ 1,851,000	$ 1,851,000	$ 1,851,000		$ 101,888,000	$ 101,541,000	$ 100,943,000	$ (58,352,000)	$ (49,167,000)	$ (40,994,000)	$ (2,266,000)	$ (1,538,000)	$ (1,317,000)
Net earnings (loss)	4,571,000	(9,185,000)	(8,173,000)														4,571,000	(9,185,000)	(8,173,000)
Dividends paid	(1,475,000)																(1,475,000)
Dividends paid (in dollars per share)																	$ 0.04
Issuance of restricted stock awards, net of forfeitures						10,000	11,000	16,000						(10,000)	(11,000)	(16,000)
Stock-based compensation														313,000	407,000	662,000
Repurchase and retirement of common stock						(2,000)	(3,000)	(2,000)						(25,000)	(49,000)	(48,000)
Unrealized gain on available-for-sale securities, net of income tax expense	27,000	(22,000)	18,000																	27,000	(22,000)	18,000
Change in net actuarial loss and prior service cost, net of income tax benefit	265,000	706,000	239,000																	(265,000)	(706,000)	(239,000)
Balance at the end of the period	48,093,000	44,949,000				1,836,000	1,828,000	1,820,000	1,851,000	1,851,000	1,851,000	1,851,000		102,166,000	101,888,000	101,541,000	(55,256,000)	(58,352,000)	(49,167,000)	(2,504,000)	(2,266,000)	(1,538,000)
Income tax expense on unrealized gain on available-for-sale securities	19,000	14,000	13,000
Income tax expense on change in net actuarial loss and prior service cost	182,000	484,000	166,000
Number of votes per share						1			10
Maximum amount allowed to pay dividends and repurchase shares of common stock under modified debt agreement					2,500,000								2,500,000
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	(2,523,000)	(2,258,000)
Accumulated unrealized gain (loss) on available-for-sale securities, net of income tax (expense) benefit	19,000	(8,000)
Accumulated other comprehensive loss	(2,504,000)	(2,266,000)
Income tax benefit on net actuarial loss and prior service cost not yet recognized in net periodic benefit cost	1,732,000	1,550,000
Income tax (expense) benefit on accumulated unrealized gain (loss) on available-for-sale securities	$ (15,000)	$ 4,000
Number of shares issued, entitled by each right	1
Minimum percentage of common stock to be acquired for rights to detach and be traded separately from common stock	10.00%
Minimum percentage of common stock to be announced for tender or exchange for rights to detach and be traded separately from common stock	10.00%
Number of shares of common stock authorized to be repurchased				2,000,000
Remaining number of shares authorized to be repurchased	1,634,607
Number of shares purchased and retired	23,779	29,575	23,814
Average purchase price of shares purchased and retired (in dollars per share)	$ 1.16	$ 1.76	$ 2.10