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Note 13 - Warrant Liability (Details Textual) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 27, 2020 | Mar. 06, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 02, 2021 | Sep. 30, 2019 | Aug. 13, 2019
Class of Warrant or Right, Outstanding (in shares) |  |  |  | 7,067,000 |  | 7,082,000 | 7,067,000 |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 6,800 | $ 0 | $ 7,098 | $ 67 |  |  |
The July 2011 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Expired During Period (in shares) |  | 35,107 | 35,107 |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  | 0 |  | 0 | 0 |  |  |  |
October 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Expired During Period (in shares) | 15,320 |  |  |  | 15,320 |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  | 0 |  | 0 | 0 |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  | 22,680 | 22,680 |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  | $ 5 | $ 5 |  |  |  |  |  |
Embedded Derivative, No Longer Bifurcated, Amount Reclassified to Stockholders' Equity |  |  |  | $ 12 |  |  |  |  |  |  |
The 2019 Domestic Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  | 0 |  | 0 | 0 |  |  |  |
Warrants and Rights Outstanding |  |  |  | $ 4,900 |  |  | $ 4,900 |  |  | $ 3,100 | $ 3,100
Warrants and Rights Outstanding |  |  |  | 4,900 |  |  | 4,900 |  |  | $ 3,100 | 3,100
The 2019 Foreign Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  |  | 4,200 |  |  | 4,200 |  |  |  | 2,000
Warrants and Rights Outstanding |  |  |  | 4,200 |  |  | 4,200 |  |  |  | 2,000
The 2019 Ladenburg Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative, No Longer Bifurcated, Amount Reclassified to Stockholders' Equity |  |  |  |  |  | $ 0 | 9,108 | $ 553 |  |  |
Warrants and Rights Outstanding |  |  |  | 200 |  |  | 200 |  |  |  | 100
Warrants and Rights Outstanding |  |  |  | $ 200 |  |  | $ 200 |  |  |  | $ 100
The 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  |  |  |  | 9,600 |  |  | $ 14,200 |  |
Warrants and Rights Outstanding |  |  |  |  |  | $ 9,600 |  |  | $ 14,200 |  |

X
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- Definition The amount of the liability for the conversion option reclassified to stockholders' equity when the embedded option no longer required separation from the host instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35708913&loc=d3e50896-113970 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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