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Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Marketable securities | $ 106,142 | $ 112,080
Corporate Bonds [Member] |  |
Available-for-sale - matures within one year, Amortized cost | 23,397 | 17,552
Available-for-sale - matures within one year, Gross unrealized gains | 0 | 0
Available-for-sale - matures within one year, Gross unrealized losses | (1,517) | (1,330)
Available-for-sale - matures within one year, Fair value | 21,880 | 16,222
Available-for-sale - matures after one year through five years, Amortized cost | 88,934 | 101,355
Available-for-sale - matures after one year through five years, Gross unrealized gains | 25 | 38
Available-for-sale - matures after one year through five years, Gross unrealized losses | (4,697) | (5,535)
Available-for-sale - matures after one year through five years, Fair value | 84,262 | 95,858
Debt Securities, Available-for-Sale, Amortized Cost | 112,331 | 118,907
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 25 | 38
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (6,214) | (6,865)
Marketable securities | $ 106,142 | $ 112,080

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