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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available for sale, amortized cost, due in one year or less | $ 36,739 |
Securities available for sale, fair value, due in one year or less | 35,856 |
Securities held to maturity, amortized cost, due in one year or less | 0 |
Securities held to maturity, fair value, due in one year or less | 0 |
Securities available for sale, amortized cost, due after one year through five years | 218,647 |
Securities available for sale, fair value, due after one year through five years | 201,651 |
Securities held to maturity, amortized cost, due after one year through five years | 0 |
Securities held to maturity, fair value, due after one year through five years | 0 |
Securities available for sale, amortized cost, due after five years through ten years | 42,163 |
Securities available for sale, fair value, due after five years through ten years | 39,334 |
Securities held to maturity, amortized cost, due after five years through ten years | 2,000 |
Securities held to maturity, fair value, due after five years through ten years | 1,507 |
Securities available for sale, amortized cost, due after ten years | 105,179 |
Securities available for sale, fair value, due after ten years | 90,762 |
Securities held to maturity, amortized cost, due after ten years | 5,000 |
Securities held to maturity, fair value, due after ten years | 3,804 |
Securities available for sale, amortized cost, single maturity | 402,728 |
Securities available for sale, fair value, single maturity | 367,603 |
Securities held to maturity, amortized cost, single maturity | 7,000 |
Securities held to maturity, fair value, single maturity | 5,311 |
Mortgage-backed securities and CMO, amortized cost | 104,738 |
Mortgage-backed securities and CMO, fair value | 93,216 |
Mortgage-backed securities and CMO, amortized cost | 0 |
Mortgage-backed securities and CMO, fair value | 0 |
Securities available for sale, amortized cost | 507,466 | $ 445,220
Securities available for sale, fair value | 460,819 | 447,335
Securities held to maturity, amortized cost | 7,000 | 2,000
Securities held to maturity, fair value | $ 5,311 | $ 2,004

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