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Note 4 - Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Securities available-for-sale $ 644,702 $ 648,513
Reported Value Measurement [Member]    
Securities available-for-sale 644,702 648,513
Estimate of Fair Value Measurement [Member]    
Securities available-for-sale 644,702 648,513
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 95,211 101,227
Interest-bearing time deposits 6,918 6,166
Accrued income receivable 12,166 13,864
Securities sold under agreements to repurchase 40,061 52,412
Accrued interest payable 2,472 3,208
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 95,211 101,227
Interest-bearing time deposits 6,826 5,938
Accrued income receivable 12,166 13,864
Securities sold under agreements to repurchase 40,061 52,412
Accrued interest payable 2,472 3,208
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
FHLB and FRB stock 3,166 3,883
Loans held for sale 341 342
Derivative financial instruments 844 996
Deposits 1,819,205 1,846,682
Other borrowings 30,652 46,952
Derivative financial instruments, liabilities 406 248
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
FHLB and FRB stock 3,166 3,883
Loans held for sale 341 342
Derivative financial instruments 844 996
Deposits 1,819,218 1,848,472
Other borrowings 30,513 46,543
Derivative financial instruments, liabilities 406 248
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans receivable 1,279,644 1,303,917
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans receivable $ 1,244,423 $ 1,261,703