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Note 5 - Fair Value Measurements - Fair Value Reconciliation of Level 3 Assets (Details) - Subordinated Debt Obligations [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Beginning of year $ 8,801 $ 8,737
Purchases 0 1,000
Transfers out of Level III (1) [1] (2,250) (1,000)
Net change in unrealized loss on investment securities available-for-sale 88 64
End of year $ 6,639 $ 8,801
[1] Transfers between hierarchy levels are based on the availability of sufficient observable inputs to meet Level II versus Level III criteria. The level designation of each financial instrument is reassessed at the end of each period.