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Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized cost |  | $ 94,536 | $ 143,952
Gross unrealized gains |  | 8 | 61
Gross unrealized losses | [1] | 364 | 778
Short-term investments |  | 94,180 | 143,235
Corporate Debt Securities [Member] |  |  |
Amortized cost | [2] | 40,601 | 59,283
Gross unrealized gains | [2] | 2 | 30
Gross unrealized losses | [1],[2] | 75 | 240
Short-term investments | [2] | 40,528 | 59,073
Certificates of Deposit [Member] |  |  |
Amortized cost |  | 22,640 | 36,500
Gross unrealized gains |  | 6 | 20
Gross unrealized losses | [1] | 7 | 41
Short-term investments |  | 22,639 | 36,479
US Treasury Securities [Member] |  |  |
Amortized cost |  | 21,918 | 34,614
Gross unrealized gains |  | 0 | 1
Gross unrealized losses | [1] | 251 | 418
Short-term investments |  | 21,667 | 34,197
Asset-Backed Securities [Member] |  |  |
Amortized cost |  | 8,652 | 12,727
Gross unrealized gains |  | 0 | 10
Gross unrealized losses | [1] | 31 | 79
Short-term investments |  | 8,621 | 12,658
Debt Security, Government, Non-US [Member] |  |  |
Amortized cost |  | 725 | 828
Gross unrealized gains |  | 0 | 0
Gross unrealized losses | [1] | 0 | 0
Short-term investments |  | $ 725 | $ 828
[1] | As of September 30, 2023, the cost and fair value of investments with loss positions was approximately $75.8 million and $75.4 million, respectively. As of December 31, 2022, the cost and fair value of investments with loss positions was approximately $86.3 million and $85.5 million, respectively. We evaluated the nature of these investments, credit worthiness of the issuer and the duration of these impairments to determine if a credit loss exists. We have the ability and intent to hold these investments to maturity.
[2] | Corporate debt securities include investments in financial and other corporate institutions. No single issuer represents a significant portion of the total corporate debt securities portfolio.

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- 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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