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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Amortized cost	$ 361,290		$ 156,750
Gross unrealized gains	138		46
Gross unrealized losses		$ (898)	(3,593)
Fair value	360,530		153,203
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	703		930
Gross unrealized gains	3		12
Gross unrealized losses	0		(8)
Fair value	706		934
US Treasury Securities [Member]
Amortized cost	246,876		115,920
Gross unrealized gains	103		0
Gross unrealized losses	(689)		(3,412)
Fair value	246,290		112,508
US Government-sponsored Enterprises Debt Securities [Member]
Amortized cost	109,900		35,446
Gross unrealized gains	1		7
Gross unrealized losses	(128)		(62)
Fair value	109,773		35,391
Residential Mortgage-Backed Securities [Member]
Amortized cost	2,949		3,431
Gross unrealized gains	31		27
Gross unrealized losses	(69)		(91)
Fair value	2,911		3,367
Collateralized Mortgage-Backed Securities [Member]
Amortized cost	862		1,023
Gross unrealized gains	0		0
Gross unrealized losses	(12)		(20)
Fair value	$ 850		$ 1,003

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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