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Note 4 - Marketable Securities - Fair Value of Marketable Securities (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Total marketable securities | $ 38,375 | $ 44,243
Fair Value, Inputs, Level 1 [Member] |  |
Total marketable securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Total marketable securities | 38,375 | 44,243
Fair Value, Inputs, Level 3 [Member] |  |
Total marketable securities | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Total marketable securities | 32,063 | 39,421
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total marketable securities | 0 | 0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total marketable securities | 32,063 | 39,421
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total marketable securities | 0 | 0
Commercial Paper and Corporate Bonds [Member] |  |
Total marketable securities | 6,312 | 4,822
Commercial Paper and Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total marketable securities | 0 | 0
Commercial Paper and Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total marketable securities | 6,312 | 4,822
Commercial Paper and Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total marketable securities | $ 0 | $ 0

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