Note 2 - Debt Securities (Details Textual) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 0	$ 0	$ 0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	95	95		103
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 0	$ 0		$ 0
Debt Securities, Held-to-Maturity, Nonaccrual	0	0		0
Debt Securities, Available-for-Sale, Restricted	18,200	18,200		16,400
Debt Securities, Available-for-Sale, Nonaccrual	$ 0	$ 0		$ 0