Note 3 - Investment Securities - Amortized Cost of Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Equity Securities, FV-NI, Amortized Cost	$ 1,471		$ 1,461
Equity Securities, FV-NI, Fair Value	1,387		1,363
Net gains (losses) recognized during the period on equity securities	14	$ (10)
Less net gains (losses) recognized during the period on equity securities sold during the period	0	0
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at period end	14	$ (10)
Mutual Fund [Member]
Equity Securities, FV-NI, Amortized Cost	1,461		1,451
Equity Securities, FV-NI, Fair Value	1,293		1,265
Equity Securities [Member]
Equity Securities, FV-NI, Amortized Cost	10		10
Equity Securities, FV-NI, Fair Value	$ 94		$ 98