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Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Marketable securities | $ 189,190 | $ 179,302
Corporate Bonds [Member] |  |
Available For Sale Securities Debt Maturities Within One Year Amortized Cost | 111,257 | 106,154
Available-for-sale - matures within one year, Gross unrealized gains | 65 | 157
Available-for-sale - matures within one year, Gross unrealized losses | (297) | (407)
Available-for-sale- matures within one year, Fair Value | 111,025 | 105,904
Available-for-sale - matures after one year through five years, amortized cost | 78,595 | 73,103
Available-for-sale - matures after one year through five years, Gross unrealized gains | 82 | 366
Available for Sale Matures after One Year Through Five Years, Gross Unrealized Loss | (512) | (71)
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value | 78,165 | 73,398
Amortized cost | 189,852 | 179,257
Gross unrealized gains | 147 | 523
Gross unrealized losses | (809) | (478)
Marketable securities | $ 189,190 | $ 179,302

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