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Note 11 - Financial Instruments - Summary of Derivative Fair Values (Details) $ in Thousands | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
Warrants, fair value | $ 281 | $ 1,915
Measurement Input, Price Volatility [Member] |  |
Warrants, volatility | 0.6 |
Financial Instrument Warrants [Member] | Non-Current Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Warrants, fair value | $ 281 | $ 1,915
Financial Instrument Warrants [Member] | Non-Current Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Price Volatility [Member] |  |
Warrants, volatility | 0.6 | 1.1

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- Definition Fair value as of the balance sheet date of all price risk derivative liabilities not designated as hedging instruments. + 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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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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