Note 8 - Investment Securities (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss		$ 5,500		$ 5,500
Equity Securities, FV-NI, Unrealized Gain (Loss)		(6,200)	$ (3,700)	9,298	$ 1,257
Equity Securities, FV-NI, Current		$ 31,456		$ 31,456		$ 22,158
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions		202		202		195
Debt Securities, Available-for-Sale, Realized Loss	$ 3,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss		$ 0		$ 0
Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense		0		0
Pledged Investment Securities		$ 132,200		$ 132,200		$ 145,700
Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions		161		161		159
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions		24		24		22
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions						6
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions						5
US Government Corporations and Agencies Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions						3