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Note 3 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Marketable securities | $ 132,695 | $ 112,080
Corporate Bonds [Member] |  |
Available-for-sale - matures within one year, Amortized cost | 27,690 | 17,552
Available-for-sale - matures within one year, Gross unrealized gains | 4 | 0
Available-for-sale - matures within one year, Gross unrealized losses | (243) | (1,330)
Available-for-sale - matures within one year, Fair value | 27,451 | 16,222
Available-for-sale - matures after one year through five years, Amortized cost | 108,700 | 101,355
Available-for-sale - matures after one year through five years, Gross unrealized gains | 278 | 38
Available-for-sale - matures after one year through five years, Gross unrealized losses | (3,734) | (5,535)
Available-for-sale - matures after one year through five years, Fair value | 105,244 | 95,858
Available-for-sale, Amortized cost | 136,390 | 118,907
Total | 282 | 38
Total | (3,977) | (6,865)
Marketable securities | $ 132,695 | $ 112,080

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