Note 2 - Significant Accounting Policies - Summary of Cash Equivalents and Short-term Investment (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Cash and cash equivalents | $ 41,548 | $ 29,635 |
| Unrealized gains | 0 | 41 |
| Unrealized losses | (98) | (5) |
| Totals, amortized cost | 100,561 | 91,627 |
| Totals, fair value | 100,463 | 91,663 |
| US Government Agencies Debt Securities [Member] | ||
| Investments, amortized cost | 35,525 | 42,739 |
| Unrealized gains | 0 | 37 |
| Unrealized losses | (63) | 0 |
| Investments, fair value | 35,462 | 42,776 |
| Corporate Bond Securities [Member] | ||
| Investments, amortized cost | 6,239 | 6,866 |
| Unrealized gains | 0 | 1 |
| Unrealized losses | (10) | (2) |
| Investments, fair value | 6,229 | 6,865 |
| Commercial Paper [Member] | ||
| Investments, amortized cost | 25,361 | 18,250 |
| Unrealized gains | 0 | 3 |
| Unrealized losses | (25) | (1) |
| Investments, fair value | 25,336 | 18,252 |
| Cash Equivalents [Member] | ||
| Cash and cash equivalents | 33,436 | 23,772 |
| Cash equivalents, unrealized gain | 0 | 0 |
| Cash equivalents, unrealized losses | 0 | (2) |
| Cash Equivalents | $ 33,436 | $ 23,770 |
| X | ||||||||||
- Definition Amount, before tax, of unrealized gains on cash and cash equivalents. No definition available.
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- Definition Amount, before tax, of unrealized losses on cash and cash equivalents. No definition available.
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| X | ||||||||||
- Definition Represents fair value of cash, cash equivalents and short-term investments. No definition available.
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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). 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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- 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/2009/role/commonPracticeRef
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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). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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