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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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Principal Transaction Revenue [Line Items]
Net trade (loss) income	$ 31,253us-gaap_NetIncomeLoss	$ 13,940us-gaap_NetIncomeLoss	$ 1,591us-gaap_NetIncomeLoss	$ 1,277us-gaap_NetIncomeLoss	$ 5,201us-gaap_NetIncomeLoss	$ 7,073us-gaap_NetIncomeLoss	$ 5,144us-gaap_NetIncomeLoss	$ 870us-gaap_NetIncomeLoss	$ 48,061us-gaap_NetIncomeLoss	$ 18,288us-gaap_NetIncomeLoss	$ 28,129us-gaap_NetIncomeLoss
Advertising Barter Transactions [Member]
Principal Transaction Revenue [Line Items]
Trade revenue									2,174	1,390	1,248
Trade expense									(2,287)	(1,262)	(1,267)
Net trade (loss) income									$ (113)	$ 128	$ (19)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.