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Note 5 - Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Securities available for sale $ 591,552 $ 656,852
Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 2 [Member]    
Securities available for sale 591,552 656,852
Fair Value, Inputs, Level 3 [Member]    
Securities available for sale 0 0
Reported Value Measurement [Member]    
Cash and due from banks 13,089 12,403
Interest-bearing deposits 40,353 59,026
Loans, net 838,794 844,519
Accrued interest receivable 6,180 6,001
Bank-owned life insurance 43,327 43,312
Deposits 1,465,000 1,542,725
Accrued interest payable 551 106
Estimate of Fair Value Measurement [Member]    
Securities available for sale 591,552 656,852
Restricted securities 1,264 941
Mortgage loans 82  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 13,089 12,403
Interest-bearing deposits 40,353 59,026
Securities available for sale 0 0
Restricted securities 0 0
Mortgage loans 0  
Loans, net 0 0
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Deposits 0 0
Accrued interest payable 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Securities available for sale 591,552 656,852
Restricted securities 1,264 941
Mortgage loans 82  
Loans, net 0 0
Accrued interest receivable 6,180 6,001
Bank-owned life insurance 43,327 43,312
Deposits 1,277,115 1,475,096
Accrued interest payable 551 106
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Securities available for sale 0 0
Restricted securities 0 0
Mortgage loans 0  
Loans, net 792,126 781,749
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Deposits 186,480 67,542
Accrued interest payable $ 0 $ 0