Note 4 - Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities available for sale	$ 206,609	$ 215,094
Fair Value, Recurring [Member]
Securities available for sale	206,609	215,094
Equity securities	394	382
Commitments to extend credit	(18)	7
Total	206,985	215,483
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Equity securities	0	0
Commitments to extend credit	0	0
Total	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	206,609	215,094
Equity securities	394	382
Commitments to extend credit	(18)	7
Total	206,985	215,483
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Equity securities	0	0
Commitments to extend credit	0	0
Total	$ 0	$ 0