Note 8 - Fair Value - Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities available for sale, at fair value	$ 121,138	$ 125,713	[1]
Fair value, held to maturity	20,251
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	52,187	64,659
Equity security	546	518
Noninterest-bearing deposits	116,187	107,197
Securities sold under repurchase agreements	2,458	5,564
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Certificates of deposit in other banks	100	100
Accrued interest receivable	2,550	2,439
Securities available for sale, at fair value	121,138	125,713
Fair value, held to maturity	17,036	17,156
Mortgage loans held for sale	0	157
Restricted stock, at cost	3,100	921
Bank owned life insurance	15,640	15,324
Fair value hedge	56	626
Interest-bearing deposits	617,909	651,609
Federal Home Loan Bank advances	50,200	5,000
Long-term debt, net	12,024	11,329
Accrued interest payable	935	1,003
Fair value hedge	251	28
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, held to maturity	4,092	3,343
Loans, net	622,457	582,993
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	52,187	64,659
Equity security	546	518
Noninterest-bearing deposits	116,187	107,197
Securities sold under repurchase agreements	2,458	5,564
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Certificates of deposit in other banks	100	100
Accrued interest receivable	2,550	2,439
Securities available for sale, at fair value	121,138	125,713
Fair value, held to maturity	16,159	15,589
Mortgage loans held for sale	0	157
Restricted stock, at cost	3,100	921
Bank owned life insurance	15,640	15,324
Fair value hedge	56	626
Interest-bearing deposits	615,437	654,346
Federal Home Loan Bank advances	49,251	4,957
Long-term debt, net	11,797	11,066
Accrued interest payable	935	1,003
Fair value hedge	233	28
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, held to maturity	4,092	3,343
Loans, net	$ 617,664	$ 572,346

[1] Derived from audited consolidated financial statements