Note 6 - Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Balance	$ 230,196	$ 218,357	$ 226,768	$ 215,782
Net change	10,522	(11,287)	6,608	(11,539)
Balance	245,542	208,717	245,542	208,717
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(43,844)	(43,390)	(39,627)	(43,137)
Net change	10,523	(11,287)	6,306	(11,540)
Balance	(33,321)	(54,677)	(33,321)	(54,677)
Reclassification of Realized Gain on Investment Securities, Net [Member]
Balance	(5,218)	(5,776)	(5,521)	(5,777)
Net change	(1)	0	302	1
Balance	(5,219)	(5,776)	(5,219)	(5,776)
Unrealized Gain (Loss), Transfer from Available for Sale to Held to Maturity, Net [Member]
Balance	1	1	1	1
Net change	0	0	0	0
Balance	1	1	1	1
AOCI Attributable to Parent [Member]
Balance	(49,061)	(49,165)	(45,147)	(48,913)
Net change	10,522	(11,287)	6,608	(11,539)
Balance	$ (38,539)	$ (60,452)	$ (38,539)	$ (60,452)