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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Assets | $ 2,596,901 | $ 2,387,814 | $ 2,252,331
Unfunded Individual Credit Commitment [Member] |  |  |
Other Commitment | 2,400,000 |  |
Unfunded Individual Credit Commitment [Member] | Contractual Obligations [Member] |  |  |
Assets | 18,700 |  |
Unfunded Outstanding Floor-Plan Financing Commitment [Member] |  |  |
Other Commitment | 9,800 |  |
Credit Protection Program [Member] |  |  |
Loss Contingency, Estimate of Possible Loss | $ 68,600 |  |

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