Note 5 - Debt Securities (Details Textual)	6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale, Realized Gain (Loss)	$ 0	$ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	$ 189,000		$ 192,000
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	17
Debt Securities, Available for Sale, Total Number of Positions	19
Debt Securities, Available-for-Sale, Unrealized Loss Position, Percent of Amortized Cost	4.60%
Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	5
Debt Securities, Available-for-Sale, Unrealized Loss Position, Percent of Amortized Cost	9.50%
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	29
Debt Securities, Available-for-Sale, Unrealized Loss Position, Percent of Amortized Cost	8.50%
Asset Pledged as Collateral [Member]
Debt Securities, Available-for-Sale, Restricted	$ 7,300,000		$ 8,100,000