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Note 2 - Significant Accounting Policies - Summary of Cash Equivalents and Short-term Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Cash and cash equivalents | $ 53,525 | $ 69,219
Unrealized gains | 25 | 16
Unrealized losses | (6) | (10)
Totals, amortized cost | 88,425 | 86,838
Totals, fair value | 88,444 | 86,844
US Government Agencies Debt Securities [Member] |  |
Investments, amortized cost | 20,433 | 17,564
Unrealized gains | 17 | 6
Unrealized losses | (1) | (2)
Investments, fair value | 20,449 | 17,568
Corporate Bond Securities [Member] |  |
Investments, amortized cost | 962 |
Unrealized gains | 0 |
Unrealized losses | 0 |
Investments, fair value | 962 |
Commercial Paper [Member] |  |
Investments, amortized cost | 19,447 | 14,179
Unrealized gains | 7 | 7
Unrealized losses | (2) | (8)
Investments, fair value | 19,452 | 14,178
Cash Equivalents [Member] |  |
Cash and cash equivalents | 47,583 | 55,095
Cash equivalents, unrealized gain | 1 | 3
Cash equivalents, unrealized losses | (3) | 0
Cash equivalents | $ 47,581 | $ 55,098

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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/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: 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 5: 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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