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Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Contingent earnout liability | $ 342 | $ 561
Fair Value, Recurring [Member] |  |
Deposit held as a certificate of deposit | 152 | 151
Total assets | 152 | 475
Contingent earnout liability | 342 | 561
Total liabilities | 342 | 10,119
Restricted cash held as a certificate of deposit |  | 324
Warrant liability |  | 9,558
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Deposit held as a certificate of deposit | 152 | 151
Total assets | 152 | 475
Restricted cash held as a certificate of deposit |  | 324
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Contingent earnout liability | 342 | 561
Total liabilities | $ 342 | 10,119
Warrant liability |  | $ 9,558

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- Definition Fair value portion of deposit held as a certificate of deposit. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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 (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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