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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.

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