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Note 12 - Fair Value - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Clene Nanomedicine contingent earn-out liability | $ 22 |  | $ 75
Initial Stockholders contingent earn-out liability | 3 |  | 10
Us Treasury Securities with Maturity Greater than 90 Days but Less than 1 Year [Member] |  |  |
Fair value | 6,178 |  | 6,179
US Treasury Securities [Member] |  |  |
Cash Equivalents | 12,191 |  | 19,884
Money Market Funds [Member] |  |  |
Cash Equivalents | 5,660 |  | 5,113
Fair Value, Inputs, Level 1 [Member] |  |  |
Clene Nanomedicine contingent earn-out liability | 0 |  | 0
Initial Stockholders contingent earn-out liability | 0 |  | 0
Fair Value, Inputs, Level 1 [Member] | Us Treasury Securities with Maturity Greater than 90 Days but Less than 1 Year [Member] |  |  |
Fair value | 0 |  | 0
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |  |
Cash Equivalents | 0 |  | 0
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Cash Equivalents | 5,660 |  | 5,113
Fair Value, Inputs, Level 2 [Member] |  |  |
Clene Nanomedicine contingent earn-out liability | 0 |  | 0
Initial Stockholders contingent earn-out liability | 0 |  | 0
Fair Value, Inputs, Level 2 [Member] | Us Treasury Securities with Maturity Greater than 90 Days but Less than 1 Year [Member] |  |  |
Fair value | 6,178 |  | 6,179
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |  |
Cash Equivalents | 12,191 |  | 19,884
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |
Cash Equivalents | 0 |  | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Clene Nanomedicine contingent earn-out liability | 22 |  | 75
Initial Stockholders contingent earn-out liability | 3 |  | 10
Fair Value, Inputs, Level 3 [Member] | Us Treasury Securities with Maturity Greater than 90 Days but Less than 1 Year [Member] |  |  |
Fair value | 0 |  | 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |  |
Cash Equivalents | 0 |  | 0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |  |
Cash Equivalents | 0 |  | 0
Common Stock Warrant Liability [Member] |  |  |
Common stock warrant liabilities | 2,790 |  | 1,481
Balance | 1,481 |  |
Change in fair value | 1,309 |  |
Balance | 2,790 |  |
Common Stock Warrant Liability [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Common stock warrant liabilities | 0 |  | 0
Common Stock Warrant Liability [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Common stock warrant liabilities | 0 |  | 0
Common Stock Warrant Liability [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Common stock warrant liabilities | 2,790 |  | $ 1,481
Clene Nanomedicine Contingent Earn-out [Member] |  |  |
Balance | 75 | $ 2,264 |
Change in fair value | (53) | 55 |
Balance | 22 | 2,319 |
Initial Stockholders Contingent Earn-out [Member] |  |  |
Balance | 10 | 291 |
Change in fair value | (7) | 7 |
Balance | $ 3 | $ 298 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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