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Note 4 - Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  |  |  |  |  | Fair Value Measurements Using |
|  |  |  |  | Quoted Prices in |  |  |  |  |  |  |
|  | Balance at |  |  | Active Markets |  |  | Significant Other |  |  | Significant Unobservable |
|  | June 30, |  |  | for Identical |  |  | Observable |  |  | Inputs |
|  | 2022 |  |  | Items |  |  | Inputs |  |  | (Level 3) |
|  |  |  |  |  | (Level 1) |  |  | (Level 2) |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit held as a certificate of deposit |  | $ | 152 |  |  | $ | 152 |  |  | $ | — |  |  | $ | — |
Total assets |  | $ | 152 |  |  | $ | 152 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liability |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Contingent earnout liability |  |  | 342 |  |  |  | — |  |  |  | — |  |  |  | 342 |
Total liabilities |  | $ | 342 |  |  | $ | — |  |  | $ | — |  |  | $ | 342 |
|  |  |  |  |  | Fair Value Measurements Using |
|  |  |  |  | Quoted Prices in |  |  |  |  |  |  |
|  | Balance at |  |  | Active Markets |  |  | Significant Other |  |  | Significant Unobservable |
|  | December 31, |  |  | for Identical |  |  | Observable |  |  | Inputs |
|  | 2021 |  |  | Items |  |  | Inputs |  |  | (Level 3) |
|  |  |  |  |  | (Level 1) |  |  | (Level 2) |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash held as a certificate of deposit |  | $ | 324 |  |  | $ | 324 |  |  | $ | — |  |  | $ | — |
Deposit held as a certificate of deposit |  |  | 151 |  |  |  | 151 |  |  |  | — |  |  |  | — |
Total assets |  | $ | 475 |  |  | $ | 475 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liability |  | $ | 9,558 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,558 |
Contingent earnout liability |  |  | 561 |  |  |  | — |  |  |  | — |  |  |  | 561 |
Total liabilities |  | $ | 10,119 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,119 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
Fair value of warrant liability at December 31, 2021 |  | $ | 9,558 |
Decrease in fair value of November 2021 Warrants |  |  | (2,056 | )
Reclassification of warrant liability to equity |  |  | (7,502 | )
Fair value of warrant liability at June 30, 2022 |  | $ | — |
Fair value of contingent liability at December 31, 2021 |  | $ | 561 |
Decrease in fair value of contingent liability |  |  | (219 | )
Fair value of contingent liability at June 30, 2022 |  | $ | 342 |
Fair value of warrant liability at December 31, 2020 |  | $ | — |
Fair value of November 2021 Warrants issued |  |  | 14,172 |
Decrease in fair value of November 2021 Warrants |  |  | (4,614 | )
Fair value of warrant liability at December 31, 2021 |  | $ | 9,558 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19279-110258 + Details
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