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Note 16 - The Financing and Warrant Liabilities - Warrant Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Feb. 18, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Proceeds allocated to warrant liabilities | $ 6,597 | $ 39 | $ 6,597 | $ 39 | $ 10,919 | $ 11,921 | $ 1,505 | $ 61 | $ 107
Change in fair value of warrants | (4,322) | (22) | (6,829) | (68) |  |  |  |  |
Investor Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 3,257 |  | 3,257 |  | 5,942 | 10,476 |  |  |
Change in fair value of warrants | (2,685) |  | (7,219) |  |  |  |  |  |
Investor Warrants [Member] |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 3,257 | 13 | 3,257 | 13 | 5,942 | 10,476 |  | 45 | 71
Change in fair value of warrants |  | (32) |  | (58) |  |  |  |  |
Placement Agent Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 431 |  | 431 |  | 817 | 1,445 |  |  |
Change in fair value of warrants | (386) |  | (1,014) |  |  |  |  |  |
Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 431 | 26 | 431 | 26 | 817 | $ 1,445 |  | 16 | 36
Change in fair value of warrants |  | 10 |  | (10) |  |  |  |  |
Investor Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 2,420 |  | 2,420 |  | 3,370 |  | 1,279 |  |
Change in fair value of warrants | (950) |  | 1,141 |  |  |  |  |  |
Placement Agent Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 423 |  | 423 |  | 590 |  | 224 |  |
Change in fair value of warrants | (167) |  | 199 |  |  |  |  |  |
Placement Agent Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 66 | $ 26 | 66 | $ 26 | $ 200 |  | $ 2 | $ 16 | $ 36
Change in fair value of warrants | $ (134) |  | $ 64 |  |  |  |  |  |

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
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