Note 4 - Balance Sheet Components - Cash and Cash Equivalents and Investments 1 (Details) - USD ($) |
Mar. 31, 2026 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|---|
| Cash and cash equivalents | $ 50,746,000 | $ 53,814,000 | $ 25,229,000 |
| Gross unrealized gains | 0 | 1,000 | 8,000 |
| Gross unrealized losses | (7,000) | (4,000) | (4,000) |
| Short-term investments | 10,276,000 | 9,993,000 | 26,494,000 |
| Investments and Cash | 61,029,000 | 63,810,000 | 51,719,000 |
| Investments and Cash, Fair Value Disclosure | 61,022,000 | 63,807,000 | 51,723,000 |
| US Treasury Securities [Member] | |||
| Cash and cash equivalents | 2,788,000 | 4,067,000 | 0 |
| Amortized Cost | 4,190,000 | 14,063,000 | 23,802,000 |
| Gross unrealized gains | 0 | 1,000 | 7,000 |
| Gross unrealized losses | (2,000) | (4,000) | (4,000) |
| Estimated Fair Value | 4,188,000 | 14,060,000 | 23,805,000 |
| Short-term investments | 1,400,000 | 9,993,000 | 23,805,000 |
| Commercial Paper [Member] | |||
| Cash and cash equivalents | 0 | ||
| Amortized Cost | 8,881,000 | ||
| Gross unrealized gains | 0 | ||
| Gross unrealized losses | (5,000) | ||
| Estimated Fair Value | 8,876,000 | ||
| Short-term investments | 8,876 | ||
| Cash [Member] | |||
| Cash and Cash Equivalents, at Carrying Value | 3,837,000 | 3,583,000 | 8,740,000 |
| Money market funds, Fair Value | 3,837,000 | 3,583,000 | 8,740,000 |
| Cash and cash equivalents | 3,837,000 | 3,583,000 | 8,740,000 |
| Money Market Funds [Member] | |||
| Cash and Cash Equivalents, at Carrying Value | 44,121,000 | 46,164,000 | 16,489,000 |
| Money market funds, Fair Value | 44,121,000 | 46,164,000 | 16,489,000 |
| Cash and cash equivalents | $ 44,121,000 | $ 46,164,000 | $ 16,489,000 |
| 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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- 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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| 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/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 Amount of cash and cash equivalent, and cash and cash equivalent restricted to withdrawal or usage; attributable to continuing operation. 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 Sum of investments and unrestricted cash as of the balance sheet date. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Represents the fair value amount of investments and cash. No definition available.
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