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Note 14 - Financial Instruments - Summary of Derivative Fair Values (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Measurement Input, Price Volatility [Member] |  |
Warrants, volatility | 1.09 |
Class B Warrants [Member] | Non-Current Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Warrants, fair value | $ 66 | $ 609
Class B Warrants [Member] | Non-Current Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Price Volatility [Member] |  |
Warrants, volatility |  | 1.09

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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=121590274&loc=SL5624163-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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- Details
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- Details
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- Details
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