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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Amortized cost, available for sale securities	$ 206,510	$ 185,917
Gross unrealized gains, available for sale securities	163	62
Gross unrealized losses, available for sale securities	(19,094)	(22,132)
Fair value, available for sale securities	187,579	163,847
Securities available for sale, AFS	0	0
Amortized cost, held to maturity	106,527	109,835
Gross unrealized gains, held to maturity securities	2	8
Gross unrealized losses, held to maturity securities	(8,801)	(10,969)
Fair value, held to maturity securities	97,728	98,874
Securities available for sale, HTM	(97)	(94)	$ (109)	$ (106)
Amortized cost, , available for sale and held to maturity securities	313,037	295,752
Gross unrealized gains, available for sale and held to maturity securities	165	70
Gross unrealized losses	(27,895)	(33,101)
Fair value, available for sale and held to maturity securities	285,307	262,721
Securities available for sale, available for sale and HTM	(97)	(94)
US Treasury Securities [Member]
Amortized cost, available for sale securities	39,319	12,483
Gross unrealized gains, available for sale securities	33	0
Gross unrealized losses, available for sale securities	(545)	(795)
Fair value, available for sale securities	38,807	11,688
Securities available for sale, AFS	0	0
Amortized cost, held to maturity	9,759	9,632
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(64)	(125)
Fair value, held to maturity securities	9,695	9,507
Securities available for sale, HTM	0	0	0	0
US Agency and Mortgage-backed Securities [Member]
Amortized cost, available for sale securities	104,600	110,480
Gross unrealized gains, available for sale securities	122	57
Gross unrealized losses, available for sale securities	(10,062)	(12,498)
Fair value, available for sale securities	94,660	98,039
Securities available for sale, AFS	0	0
Amortized cost, held to maturity	83,126	86,554
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(7,116)	(9,282)
Fair value, held to maturity securities	76,010	77,272
Securities available for sale, HTM	0	0	0	0
US States and Political Subdivisions Debt Securities [Member]
Amortized cost, available for sale securities	62,591	62,954
Gross unrealized gains, available for sale securities	8	5
Gross unrealized losses, available for sale securities	(8,487)	(8,839)
Fair value, available for sale securities	54,112	54,120
Securities available for sale, AFS	0	0
Amortized cost, held to maturity	10,642	10,649
Gross unrealized gains, held to maturity securities	2	8
Gross unrealized losses, held to maturity securities	(1,202)	(1,112)
Fair value, held to maturity securities	9,442	9,545
Securities available for sale, HTM	0	0	(1)	0
Corporate Debt Securities [Member]
Amortized cost, held to maturity	3,000	3,000
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(419)	(450)
Fair value, held to maturity securities	2,581	2,550
Securities available for sale, HTM	$ (97)	$ (94)	$ (108)	$ (106)

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