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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
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)