Note 3 - Loans - Summary of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Dec. 30, 2022
Loans	$ 972,974	$ 969,430	$ 917,967
Allowance for credit losses	(12,603)	(11,974)	(8,717)	$ (7,446)	$ (7,446)
Loans, net	960,371	957,456
Commercial and Industrial Loans [Member]
Loans	113,562	113,074	110,937
Allowance for credit losses	(4,493)	(3,706)	(617)	(1,874)	(1,874)
Consumer and Other Loans [Member]
Loans	13,949	12,035	8,117
Allowance for credit losses	(74)	(99)	(94)	(309)	(309)
Construction and Land Development [Member] | Real Estate 1 [Member]
Loans	53,364	52,680	48,610
Allowance for credit losses	(355)	(312)	(244)	(546)	(546)
Secured by Multi-family Residential Properties [Member] | Real Estate 1 [Member]
Loans	347,014	344,369	334,302
Allowance for credit losses	(2,757)	(3,159)	(2,596)	(1,108)	(1,108)
Other Real Estate Loans [Member] | Real Estate 1 [Member]
Loans	445,085	447,272	416,001
Allowance for credit losses	$ (4,924)	$ (4,698)	$ (5,166)	$ (3,609)	$ (3,609)