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Note 10 - FAIR VALUE - Changes In Fair Values of Trading Securities (Details) - Trading securities - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
FAIR VALUE |  |  |  |
Balance at the beginning of the period | $ 82,900 | $ 22,362 | $ 83,529 | $ 22,369
Trading securities purchased |  | 36,670 |  | 36,670
Paydowns | (42) |  | (123) |
Premium amortization | (240) | (147) | (711) | (407)
Fair value gain (loss) | $ 607 | $ (200) | $ 530 | $ 53
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Fair Value Gain Loss On Derivatives An Trading Securities | Fair Value Gain Loss On Derivatives An Trading Securities | Fair Value Gain Loss On Derivatives An Trading Securities | Fair Value Gain Loss On Derivatives An Trading Securities
Balance at the end of the period | $ 83,225 | $ 58,685 | $ 83,225 | $ 58,685

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