Operations and Significant Accounting Policies (Details Textual) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2008	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operations and Significant Accounting Policies (Textual) [Abstract]
Restricted cash, noncurrent		$ 3,624,000	$ 3,594,000
Carrying value of cost method investments		2,300,000	1,500,000
Maximum exposure to losses		2,225,000	3,093,000
Operations and Significant Accounting Policies (Additional Textual) [Abstract]
Non-cash termination charge recognized, net	5,000,000
New agreement expiration period	2013-04
Duration of non-cash benefit to be recognized	5 years
Highly liquid investment maximum maturity period		90 days
Short term investment maturity period, minimum		91 days
Short term investments maturity period, maximum		1 year
Impairments on the short-term investments		0
Carrying value of equity method investments		1,500,000	1,600,000
Short-term investments carrying value			33,481,000
Pre-tax income from continuing operations			3,300,000
Net income increased			2,200,000
Increased diluted net income from continuing operations per share			$ 0.24
Fixed interest rate debt, totaled		0	61,800,000
Advertising expense		1,400,000	2,000,000	2,400,000
Unrecognized tax benefits		632,000	632,000
Retained earnings		102,431,000	179,676,000
Unrecognized tax benefits that would impact the effective tax rate		410,000	410,000
South Sound [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Carrying value of cost method investments		750,000
Cost method investment ownership percentage		7.50%
Maximum exposure to losses		1,400,000
Number of stations having primary beneficiary variable interest		2	2
Debt security investments [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Restricted cash		3,500,000	3,500,000
Machinery and equipment [Member] | Maximum [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Increase in the lives of machinery and equipment			10 years
Machinery and equipment [Member] | Minimum [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Increase in the lives of machinery and equipment			1 year
Restricted Stock Units (RSUs) [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Restricted stock rights and options			40	129,391
Stock Options [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Restricted stock rights and options		131,923	204,645	275,420
Level 1 inputs [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Fair value of debt security investments		3,500,000	36,900,000
Cash equivalents		5,000,000	140,500,000
Level 2 inputs [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Estimated fair value of the Company's debt			62,900,000
Television and Radio Transmitting Facilities Lease Agreements [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Operating leases lease term		30 years
Tower Locations Lease Agreements [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Operating leases lease term		5 years
Corporate Headquarters Lease Agreement [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Operating leases lease term		12 years
Fair Value on Recurring Basis [Member] | Level 1 inputs [Member]
Operations and Significant Accounting Policies (Textual) [Abstract]
Fair value of marketable securities		$ 600,000	$ 1,000,000