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Note 2 - Securities Available for Sale - Gross Unrealized Losses and Fair Value of Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair value, less than 12 months	$ 5,469	$ 41,496
Unrealized loss, less than 12 months	44	673
Fair value, 12 months or longer	122,812	129,014
Unrealized loss, 12 months or longer	18,436	23,868
Total fair value	128,281	170,510
Total unrealized loss	18,480	24,541
Collateralized Mortgage-Backed Securities [Member]
Fair value, less than 12 months	0	346
Unrealized loss, less than 12 months	0	9
Fair value, 12 months or longer	8,720	9,193
Unrealized loss, 12 months or longer	1,302	1,665
Total fair value	8,720	9,539
Total unrealized loss	1,302	1,674
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Fair value, less than 12 months	1,589	21,145
Unrealized loss, less than 12 months	12	330
Fair value, 12 months or longer	93,614	95,587
Unrealized loss, 12 months or longer	14,631	19,211
Total fair value	95,203	116,732
Total unrealized loss	14,643	19,541
US Government-sponsored Enterprises Debt Securities [Member]
Fair value, less than 12 months	0	0
Unrealized loss, less than 12 months	0	0
Fair value, 12 months or longer	4,822	5,445
Unrealized loss, 12 months or longer	541	722
Total fair value	4,822	5,445
Total unrealized loss	541	722
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 months	3,880	20,005
Unrealized loss, less than 12 months	32	334
Fair value, 12 months or longer	6,856	5,063
Unrealized loss, 12 months or longer	762	996
Total fair value	10,736	25,068
Total unrealized loss	794	1,330
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Fair value, less than 12 months		0
Unrealized loss, less than 12 months		0
Fair value, 12 months or longer		2,440
Unrealized loss, 12 months or longer		60
Total fair value		2,440
Total unrealized loss		60
Other Debt Obligations [Member]
Fair value, less than 12 months	0	0
Unrealized loss, less than 12 months	0	0
Fair value, 12 months or longer	8,800	11,286
Unrealized loss, 12 months or longer	1,200	1,214
Total fair value	8,800	11,286
Total unrealized loss	$ 1,200	$ 1,214

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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