Note 4 - Fair Value Measurements (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Equity Securities, FV-NI, Total	$ 29,494,000	$ 20,609,000
Equity Securities without Readily Determinable Fair Value, Amount	$ 800,000	407,000
Length of Time Generally Receive New Appraisal on Foreclosed Properties (Month)	18 months
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Equity Securities, FV-NI, Total	$ 5,200,000
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity Securities, FV-NI, Total	2,900,000
Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Equity Securities, FV-NI, Total	$ 20,500,000	$ 20,200,000