Note 3 - Investment Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity Securities, FV-NI	$ 1,320
Equity Securities, FV-NI, Unrealized Gain (Loss)	195	$ (0)
Precision BioSciences, Inc. [Member]
Equity Securities, FV-NI	1,300
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 200