Note 6 - Summary of Unrealized and Realized Gains and Losses Recognized in Net Income on Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity Securities [Abstract]
Net (loss) gains recognized during the period on equity securities	$ 347	$ (151)
Less: Net (losses) gains recognized during the period on equity securities sold during the period	377	(208)
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date	$ (30)	$ 57