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Note 2 - Fair Value of Financial Instruments | 9 Months Ended
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Sep. 30, 2025
Notes to Financial Statements |
Fair Value Disclosures [Text Block] | 2. Fair Value of Financial Instruments The estimated fair values of the Company’s financial instruments, which include cash equivalents, accounts receivable, accounts payable and other accrued liabilities, approximate their carrying values due to the short-term nature of these instruments. The Company’s marketable securities are classified as available-for-sale and are reported at fair value. Unrealized holding gains and losses are excluded from earnings and are reported net of tax in “accumulated other comprehensive loss” in the Consolidated Balance Sheets until realized. Realized gains and losses are included in “other income, net” in the Consolidated Statements of Operations and Comprehensive Loss and are derived using the specific identification method for determining the cost of marketable securities sold. In accordance with Accounting Standards Codification (“ASC”) No. 820 “Fair Value Measurements and Disclosures”, the Company defines its fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, in the following:
| • | Level 1 Pricing inputs are quoted prices available in active markets for identical investments as of the reporting date.
| • | Level 2 Pricing inputs are quoted for similar investments, or inputs that are observable, either directly or indirectly, for substantially the full term through corroboration with observable market data. Level 2 includes investments valued at quoted prices adjusted for legal or contractual restrictions specific to these investments.
| • | Level 3 Pricing inputs are unobservable for the investment; that is, the inputs reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability.
The Company’s fair value hierarchy for its cash equivalents and marketable securities was as follows:
September 30, 2025 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Money market securities |  | $ | 1,604 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,604 |
Commercial paper |  |  | — |  |  |  | 4,390 |  |  |  | — |  |  |  | 4,390 |
Federal agency notes |  |  | — |  |  |  | 3,212 |  |  |  | — |  |  |  | 3,212 |
U.S. treasuries |  |  | — |  |  |  | 1,996 |  |  |  | — |  |  |  | 1,996 |
Total |  | $ | 1,604 |  |  | $ | 9,598 |  |  | $ | — |  |  | $ | 11,202 |
December 31, 2024 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Money market securities |  | $ | 112 |  |  | $ | — |  |  | $ | — |  |  | $ | 112 |
Commercial paper |  |  | — |  |  |  | 10,633 |  |  |  | — |  |  |  | 10,633 |
U.S. treasuries |  |  | — |  |  |  | 9,192 |  |  |  | — |  |  |  | 9,192 |
Federal agency notes |  |  | — |  |  |  | 5,317 |  |  |  | — |  |  |  | 5,317 |
Total |  | $ | 112 |  |  | $ | 25,142 |  |  | $ | — |  |  | $ | 25,254 |
The fair value maturities of the Company’s cash equivalents and marketable securities as of September 30, 2025, were as follows:
|  | Maturities by Period |
|  |  |  |  |  | Less than |  |  | 1-5 |  |  | 5-10 |  |  | More than |
|  | Total |  |  | 1 year |  |  | years |  |  | years |  |  | 10 years |
Cash equivalents and marketable securities |  | $ | 11,202 |  |  | $ | 11,202 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
The Company considers all highly liquid marketable securities with original maturities of 90 days or less at the date of acquisition to be cash equivalents. Cash equivalents include commercial paper, federal agency notes, U.S. treasuries, and money market securities totaling $7,741 and $8,889 at September 30, 2025 and December 31, 2024, respectively. Cash equivalents are carried at either cost or fair value, depending on the type of security.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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