Note 3 - Investment Securities - Amortized Cost of Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity Securities, FV-NI, Amortized Cost	$ 1,461	$ 1,425
Equity Securities, FV-NI, Fair Value	1,363	1,336
Net losses recognized during the period on equity securities	(9)	(5)	$ (292)
Less net losses recognized on equity securities sold during the period	0	(61)	0
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at period end	(9)	56	$ (292)
Mutual Fund [Member]
Equity Securities, FV-NI, Amortized Cost	1,451	1,415
Equity Securities, FV-NI, Fair Value	1,265	1,240
Equity Securities [Member]
Equity Securities, FV-NI, Amortized Cost	10	10
Equity Securities, FV-NI, Fair Value	$ 98	$ 96