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Note 5 - Fair Value Measurements - Estimated Fair Value of the Company's Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Reported Value Measurement [Member]    
Financial assets:    
Net loans $ 1,583,995 $ 1,497,167
Mortgage servicing rights 1,423 1,497
Financial liabilities:    
Non-maturing deposits 1,351,857 1,197,989
Time deposits 270,445 247,704
Other borrowings 11,502 11,660
Estimate of Fair Value Measurement [Member]    
Financial assets:    
Net loans 1,572,635 1,462,650
Mortgage servicing rights 2,398 2,522
Financial liabilities:    
Non-maturing deposits 1,351,857 1,197,989
Time deposits 269,408 245,999
Other borrowings 11,502 11,660
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets:    
Net loans 0 0
Mortgage servicing rights 0 0
Financial liabilities:    
Non-maturing deposits 1,351,857 1,197,989
Time deposits 0 0
Other borrowings 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial assets:    
Net loans 0 0
Mortgage servicing rights 0 0
Financial liabilities:    
Non-maturing deposits 0 0
Time deposits 0 0
Other borrowings 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial assets:    
Net loans 1,572,635 1,462,650
Mortgage servicing rights 2,398 2,522
Financial liabilities:    
Non-maturing deposits 0 0
Time deposits 269,408 245,999
Other borrowings $ 11,502 $ 11,660