Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) - Trader Barter Revenue and Expense Recognized (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Principal Transaction Revenue [Line Items]
Net trade barter income (loss)	$ 5,201	$ 7,073	$ 5,144	$ 870	$ (2,109)	$ 15,873	$ 10,994	$ 3,371	$ 18,288	$ 28,129	$ 9,035
Advertising Barter Transactions [Member]
Principal Transaction Revenue [Line Items]
Trade barter revenue									1,390	1,248	1,529
Trade barter expense									(1,262)	(1,267)	(1,421)
Net trade barter income (loss)									$ 128	$ (19)	$ 108