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Note 6 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value | $ 35,144 |
Money Market Funds [Member] |  |
Cash equivalents, fair value | 596 |
US Treasury and Government [Member] |  |
Fair value | 18,915 |
Corporate Debt Securities [Member] |  |
Fair value | 6,485 |
Certificates of Deposit [Member] |  |
Fair value | 7,733 |
Fair Value, Recurring [Member] |  |
Fair value | 35,144 | $ 44,556
Total assets at fair value | 35,740 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value | 18,915 | 28,693
Total assets at fair value | 19,511 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value | 16,229 | 15,863
Total assets at fair value | 16,229 |
Fair Value, Recurring [Member] | Money Market Funds [Member] |  |
Cash equivalents, fair value | 596 |
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents, fair value | 596 |
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents, fair value | 0 |
Fair Value, Recurring [Member] | Commercial Paper [Member] |  |
Cash equivalents, fair value | 2,011 |
Fair Value, Recurring [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents, fair value | 0 |
Fair Value, Recurring [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents, fair value | 2,011 |
Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Fair value | 18,915 | 28,693
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value | 18,915 | 28,693
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Fair value | 6,485 | 2,387
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value | 6,485 | 2,387
Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Fair value |  | 9,392
Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value |  | 0
Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value |  | 9,392
Fair Value, Recurring [Member] | Certificates of Deposit [Member] |  |
Fair value | 7,733 | 4,084
Fair Value, Recurring [Member] | Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value | 0 | 0
Fair Value, Recurring [Member] | Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value | $ 7,733 | $ 4,084

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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/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 2: 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 3: 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//1943274/2147479853/942-210-S99-1 Reference 4: 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 No definition available. + Details
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