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Note 2 - Investments - Maturities of Debt Securities (Details) $ in Thousands | Dec. 31, 2022 USD ($)
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One year or less, amortized cost | $ 2,432
One year or less, fair value | 2,440
Greater than one year through five years, amortized cost | 551
Greater than one year through five years, fair value | 552
Held-to-maturity securities, amortized cost | 2,983
Held-to-maturity securities, fair value | $ 2,992

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