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Note 5 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value of Derivatives $ 2,055 $ 393 [1]
Available-for-sale securities 1,493
Fair Value, Inputs, Level 1 [Member]    
Fair Value of Derivatives [1]
Available-for-sale securities 1,493
Fair Value, Inputs, Level 2 [Member]    
Fair Value of Derivatives 2,055 393 [1]
Available-for-sale securities
Fair Value, Inputs, Level 3 [Member]    
Fair Value of Derivatives [1]
Available-for-sale securities
[1] Includes derivative liabilities of $487 at December 31, 2017.