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Note 3 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value of Derivatives | [1] | $ 393 | $ (4,293)
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value of Derivatives | [1] |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value of Derivatives | [1] | 393 | (4,293)
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value of Derivatives | [1] |  |
[1] | Includes derivative liabilities of $487 and assets of $26 at December 31, 2017 and 2016, respectively.

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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