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Note 11 - Financial Instruments - Valuation of Financial Instruments (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets measured at fair value on a recurring basis | $ 165 | $ 1,153
Current liability | 281 | 1,915
Non-current liability | 1,257 | 359
Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Current liability |  |
Non-current liability |  |
Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value on a recurring basis | 165 | 1,153
Current liability |  |
Non-current liability | 1,257 | 359
Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Current liability | 281 | 1,915
Non-current liability |  |

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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability, current. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability, noncurrent. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Details
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