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Note 1 - Description of Business and Summary of Significant Accounting Policies - Trade Revenue and Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net trade income (loss) | $ 35,834 | $ (213) | $ 17,662 | $ 8,990 | $ 14,987 | $ 6,609 | $ 12,110 | $ 5,595 | $ 62,273 | $ 39,301 | $ 48,061
Advertising Barter Transactions [Member] |  |  |  |  |  |  |  |  |  |  |
Trade revenue |  |  |  |  |  |  |  |  | 2,069 | 2,299 | 2,174
Trade expense |  |  |  |  |  |  |  |  | (1,997) | (2,188) | (2,287)
Net trade income (loss) |  |  |  |  |  |  |  |  | $ 72 | $ 111 | $ (113)

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