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Note 2 - Investment Securities - Investment Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Available for sale debt securities, continuous unrealized loss position less than 12 months, fair value | $ 30,074 | $ 10,211
Available for sale debt securities, continuous unrealized loss position less than 12 months, gross unrealized losses | (638) | (143)
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, fair value | 216,360 | 229,580
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, gross unrealized losses | (19,855) | (17,731)
US Government Agencies Debt Securities [Member] |  |
Available for sale debt securities, continuous unrealized loss position less than 12 months, fair value | 0 | 0
Available for sale debt securities, continuous unrealized loss position less than 12 months, gross unrealized losses | 0 | 0
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, fair value | 1,811 | 1,848
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, gross unrealized losses | (116) | (86)
US Treasury and Government [Member] |  |
Available for sale debt securities, continuous unrealized loss position less than 12 months, fair value | 0 | 0
Available for sale debt securities, continuous unrealized loss position less than 12 months, gross unrealized losses | 0 | 0
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, fair value | 43,926 | 44,308
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, gross unrealized losses | (3,749) | (3,357)
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale debt securities, continuous unrealized loss position less than 12 months, fair value | 17,226 | 4,250
Available for sale debt securities, continuous unrealized loss position less than 12 months, gross unrealized losses | (541) | (101)
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, fair value | 97,723 | 107,365
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, gross unrealized losses | (10,285) | (9,097)
Corporate Debt Securities [Member] |  |
Available for sale debt securities, continuous unrealized loss position less than 12 months, fair value | 0 | 0
Available for sale debt securities, continuous unrealized loss position less than 12 months, gross unrealized losses | 0 | 0
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, fair value | 1,970 | 1,971
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, gross unrealized losses | (30) | (29)
Mortgage-backed Securities and Collateralized Mortgage Obligations [Member] |  |
Available for sale debt securities, continuous unrealized loss position less than 12 months, fair value | 11,492 | 5,961
Available for sale debt securities, continuous unrealized loss position less than 12 months, gross unrealized losses | (97) | (42)
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, fair value | 70,783 | 73,924
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, gross unrealized losses | (5,674) | (5,161)
Asset-Backed Securities [Member] |  |
Available for sale debt securities, continuous unrealized loss position less than 12 months, fair value | 1,356 | 0
Available for sale debt securities, continuous unrealized loss position less than 12 months, gross unrealized losses | 0 | 0
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, fair value | 147 | 164
Available for sale debt securities, continuous unrealized loss position for 12 months or longer, gross unrealized losses | $ (1) | $ (1)

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