Note 8 - Investment Securities (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss		$ 6,300		$ 6,300
Equity Securities, FV-NI, Unrealized Gain (Loss)		10,700	$ 1,000	15,516	$ 4,919
Equity Securities, FV-NI, Current		$ 37,674		$ 37,674		$ 22,158
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions		203		203		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		$ 235,100		$ 235,100		$ 145,700
Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions		159		159		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