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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
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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 | $ 31,253 us-gaap_NetIncomeLoss | $ 13,940 us-gaap_NetIncomeLoss | $ 1,591 us-gaap_NetIncomeLoss | $ 1,277 us-gaap_NetIncomeLoss | $ 5,201 us-gaap_NetIncomeLoss | $ 7,073 us-gaap_NetIncomeLoss | $ 5,144 us-gaap_NetIncomeLoss | $ 870 us-gaap_NetIncomeLoss | $ 48,061 us-gaap_NetIncomeLoss | $ 18,288 us-gaap_NetIncomeLoss | $ 28,129 us-gaap_NetIncomeLoss
Advertising Barter Transactions [Member] |  |  |  |  |  |  |  |  |  |  |
Principal Transaction Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Trade revenue |  |  |  |  |  |  |  |  | 2,174 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue / us-gaap_NonmonetaryTransactionTypeAxis = us-gaap_AdvertisingBarterTransactionsMember | 1,390 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue / us-gaap_NonmonetaryTransactionTypeAxis = us-gaap_AdvertisingBarterTransactionsMember | 1,248 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue / us-gaap_NonmonetaryTransactionTypeAxis = us-gaap_AdvertisingBarterTransactionsMember
Trade expense |  |  |  |  |  |  |  |  | (2,287)us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts / us-gaap_NonmonetaryTransactionTypeAxis = us-gaap_AdvertisingBarterTransactionsMember | (1,262)us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts / us-gaap_NonmonetaryTransactionTypeAxis = us-gaap_AdvertisingBarterTransactionsMember | (1,267)us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts / us-gaap_NonmonetaryTransactionTypeAxis = us-gaap_AdvertisingBarterTransactionsMember
Net trade (loss) income |  |  |  |  |  |  |  |  | $ (113)us-gaap_NetIncomeLoss / us-gaap_NonmonetaryTransactionTypeAxis = us-gaap_AdvertisingBarterTransactionsMember | $ 128 us-gaap_NetIncomeLoss / us-gaap_NonmonetaryTransactionTypeAxis = us-gaap_AdvertisingBarterTransactionsMember | $ (19)us-gaap_NetIncomeLoss / us-gaap_NonmonetaryTransactionTypeAxis = us-gaap_AdvertisingBarterTransactionsMember

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- Definition Total expense recognized from advertising barter transactions for each income statement presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406959&loc=d3e49171-111630 + Details
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