Note 11 - Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities available for sale	$ 428,144	$ 437,271
Equity securities (included in other assets)	1,200	1,300
Reported Value Measurement [Member]
Cash and cash equivalents	42,092	38,670
Interest-bearing time deposits	3,185	3,920
Securities available for sale	428,144	437,271
Securities held to maturity	7,000	7,000
Loans held for sale	759	800
Loans, net	621,377	614,409
FHLB and other restricted stock	1,836	1,836
Accrued interest receivable	4,442	4,788
Equity securities (included in other assets)	1,193	1,260
Deposits	1,010,092	1,025,211
Borrowed funds	33,625	21,500
Accrued interest payable	1,398	1,209
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	42,092	38,670
Interest-bearing time deposits	3,178	3,925
Securities available for sale	428,144	437,271
Securities held to maturity	4,405	4,446
Loans held for sale	765	811
Loans, net	618,055	609,243
Accrued interest receivable	4,442	4,788
Equity securities (included in other assets)	1,193	1,260
Deposits	1,008,683	1,023,813
Borrowed funds	33,509	21,470
Accrued interest payable	1,398	1,209
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	42,092	38,670
Interest-bearing time deposits	0	0
Securities available for sale	58,362	63,084
Securities held to maturity	0	0
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Equity securities (included in other assets)	1,193	1,260
Deposits	0	0
Borrowed funds	0	0
Accrued interest payable	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Interest-bearing time deposits	3,178	3,925
Securities available for sale	369,782	374,187
Securities held to maturity	4,405	4,446
Loans held for sale	765	811
Loans, net	0	0
Accrued interest receivable	4,442	4,788
Equity securities (included in other assets)	0	0
Deposits	0	0
Borrowed funds	33,509	21,470
Accrued interest payable	1,398	1,209
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Interest-bearing time deposits	0	0
Securities available for sale	0	0
Securities held to maturity	0	0
Loans held for sale	0	0
Loans, net	618,055	609,243
Accrued interest receivable	0	0
Equity securities (included in other assets)	0	0
Deposits	1,008,683	1,023,813
Borrowed funds	0	0
Accrued interest payable	$ 0	$ 0