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Note 8 - FAIR VALUE - Changes in fair values of trading securites (Details) - Trading securities - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at the beginning of the period | $ 22,362 |  | $ 22,369 |
Trading securities purchased | 36,670 |  | 36,670 |
Fair value gain (loss) | $ (347) |  | $ (354) |
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 | $ 58,685 |  | $ 58,685 |

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