Note 8 - Investment Securities (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	$ 5,900	$ 5,900
Equity Securities, FV-NI, Unrealized Gain (Loss)		4,853	$ 5,874
Equity Securities, FV-NI, Current	$ 27,011	$ 27,011		$ 22,158
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	193	193		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
Pledged Investment Securities	$ 144,000	$ 144,000		$ 145,700
Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	158	158		159
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	21	21		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