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Note 3 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Marketable securities | $ 112,080 | $ 90,298
Corporate Bonds [Member] |  |
Available-for-sale - matures within one year, Amortized cost | 17,552 | 11,937
Available-for-sale - matures within one year, Gross unrealized gains | 0 | 39
Available-for-sale - matures within one year, Gross unrealized losses | (1,330) | (7)
Available-for-sale - matures within one year, Fair value | 16,222 | 11,969
Available-for-sale - matures after one year through five years, Amortized cost | 101,355 | 78,920
Available-for-sale - matures after one year through five years, Gross unrealized gains | 38 | 227
Available-for-sale - matures after one year through five years, Gross unrealized losses | (5,535) | (818)
Available-for-sale - matures after one year through five years, Fair value | 95,858 | 78,329
Available-for-sale, Amortized cost | 118,907 | 90,857
Total | 38 | 266
Total | (6,865) | (825)
Marketable securities | $ 112,080 | $ 90,298

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