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Note 15 - Warrant Liabilities - Warrant Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Feb. 18, 2021
Proceeds allocated to warrant liabilities | $ 257 | $ 6,597 |  | $ 257 | $ 6,597 |  |  | $ 1,505 |  | $ 1,244 | $ 10,919 |  | $ 11,921 |
Change in fair value of warrants | (987) | (4,322) |  | (1,782) | (6,829) |  | $ 2,039 |  |  |  |  |  |  |
Investor Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 167 | 3,257 |  | 167 | 3,257 |  | 964 |  |  | 626 | 5,942 | [1] | 10,476 |
Change in fair value of warrants | (459) | (2,685) |  | (797) | (7,219) |  | 964 |  |  |  |  |  |  |
Placement Agent Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 22 | 431 | [1] | 22 | 431 | [1] | 132 |  |  | 84 | 817 | [1] | $ 1,445 | [1]
Change in fair value of warrants | (62) | (386) |  | (110) | (1,014) |  | 132 |  |  |  |  |  |  |
Investor Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 57 | 2,420 |  | 57 | 2,420 |  | 795 | 1,279 |  | 449 | 3,370 |  |  |
Change in fair value of warrants | (392) | (950) |  | (738) | 1,141 |  | 795 |  |  |  |  |  |  |
Placement Agent Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 11 | 423 |  | 11 | 423 |  | 148 | 224 |  | $ 85 | 590 |  |  |
Change in fair value of warrants | $ (74) | (167) |  | $ (137) | 199 |  | $ 148 | 224 |  |  |  |  |  |
Placement Agent Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities |  | 66 |  |  | 66 |  |  | $ 2 | [2] |  | $ 200 | [2] |  |
Change in fair value of warrants |  | $ (134) |  |  | $ 64 |  |  |  |  |  |  |  |  |
[1] | Closing date of the 2021 Financing.
[2] | The investor warrants issued in the 2018 Financing expired in July 2020. The placement agent warrants issued in the 2018 Financing were cashless exercised in July 2021.

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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 https://asc.fasb.org/extlink&oid=126954810&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 https://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
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