Note 2 - Investment Securities - Amortized Cost of Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Equity Securities, FV-NI, Amortized Cost	$ 1,511		$ 1,501
Equity Securities, FV-NI, Fair Value	1,422		1,433
Net gains (losses) recognized during the period on equity securities	(22)	$ 14
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	(22)	$ 14
Mutual Fund [Member]
Equity Securities, FV-NI, Amortized Cost	1,501		1,491
Equity Securities, FV-NI, Fair Value	1,348		1,345
Equity Securities [Member]
Equity Securities, FV-NI, Amortized Cost	10		10
Equity Securities, FV-NI, Fair Value	$ 74		$ 88