Note 5 - Cash, Cash Equivalents and Investments - Investments (Details) - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Sep. 30, 2023 |
Dec. 31, 2022 |
|
| Amortized cost | $ 11,915 | |
| Unrealized gains | 1 | |
| Unrealized losses | 0 | |
| Fair Value | 11,916 | |
| US Treasury Securities [Member] | ||
| Amortized cost | 11,915 | |
| Unrealized gains | 1 | |
| Unrealized losses | 0 | |
| Fair Value | $ 11,916 | $ 3,573 |
| US Treasury Securities [Member] | Minimum [Member] | ||
| Contractual Maturity Period (Day) | 3 days | |
| US Treasury Securities [Member] | Maximum [Member] | ||
| Contractual Maturity Period (Day) | 101 days |
| X | ||||||||||
- Definition Contractual maturity period for debt securities, available-for-sale securities. No definition available.
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| X | ||||||||||
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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