Note 1 - Description of Business and Summary of Significant Accounting Policies (Detail) - Trader barter revenue and expense recognized (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net trade barter (loss) income	$ (2,109)	$ 15,873	$ 10,994	$ 3,371	$ 7,575	$ 1,984	$ 2,559	$ (3,083)	$ 28,129	$ 9,035	$ 23,163
Advertising Barter Transactions [Member]
Trade barter revenue									1,248	1,529	1,481
Trade barter expense									(1,267)	(1,421)	(1,354)
Net trade barter (loss) income									$ (19)	$ 108	$ 127