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Note 4 - Investment Securities - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale, amortized cost | $ 347,070 | $ 288,088
Available for sale, gross unrealized gains | 620 | 3
Available for sale, gross unrealized losses | (28,729) | (31,261)
Available for sale | 318,961 | 256,830
Held to maturity (fair value of $5,097 and $5,563 at December 31, 2023 and December 31, 2022) | 5,209 | 5,729
Held to maturity, gross unrealized gains | 3 | 7
Held to maturity, gross unrealized losses | (115) | (173)
Securities held to maturity, fair value | 5,097 | 5,563
US Government Agencies Debt Securities [Member] |  |
Available for sale, amortized cost | 8,705 | 5,012
Available for sale, gross unrealized gains | 0 | 0
Available for sale, gross unrealized losses | (544) | (517)
Available for sale | 8,161 | 4,495
Small Business Administration Agency Securities [Member] |  |
Available for sale, amortized cost | 13,289 | 2,634
Available for sale, gross unrealized gains | 144 | 0
Available for sale, gross unrealized losses | (216) | (223)
Available for sale | 13,217 | 2,411
Residential Mortgage-Backed Securities [Member] |  |
Available for sale, amortized cost | 40,507 | 44,809
Available for sale, gross unrealized gains | 0 | 0
Available for sale, gross unrealized losses | (5,855) | (6,752)
Available for sale | 34,652 | 38,057
Residential Collateralized Mortgage Obligations [Member] |  |
Available for sale, amortized cost | 94,071 | 82,759
Available for sale, gross unrealized gains | 454 | 0
Available for sale, gross unrealized losses | (12,198) | (12,856)
Available for sale | 82,327 | 69,903
Commercial Mortgage-Backed Securities [Member] |  |
Available for sale, amortized cost |  | 4,887
Available for sale, gross unrealized gains |  | 0
Available for sale, gross unrealized losses |  | (16)
Available for sale |  | 4,871
Commercial Collateralized Mortgage Obligations [Member] |  |
Available for sale, amortized cost | 69,941 | 44,591
Available for sale, gross unrealized gains | 22 | 0
Available for sale, gross unrealized losses | (2,664) | (2,901)
Available for sale | 67,299 | 41,690
Commercial Paper [Member] |  |
Available for sale, amortized cost | 73,121 | 49,551
Available for sale, gross unrealized gains | 0 | 2
Available for sale, gross unrealized losses | (16) | (16)
Available for sale | 73,105 | 49,537
Corporate Debt Securities [Member] |  |
Available for sale, amortized cost | 34,800 | 41,176
Available for sale, gross unrealized gains | 0 | 1
Available for sale, gross unrealized losses | (4,109) | (4,165)
Available for sale | 30,691 | 37,012
Municipal Bonds [Member] |  |
Available for sale, amortized cost | 12,636 | 12,669
Available for sale, gross unrealized gains | 0 | 0
Available for sale, gross unrealized losses | (3,127) | (3,815)
Available for sale | 9,509 | 8,854
Held to maturity (fair value of $5,097 and $5,563 at December 31, 2023 and December 31, 2022) | 4,708 | 4,726
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (115) | (170)
Securities held to maturity, fair value | 4,593 | 4,556
Taxable Municipal Bonds [Member] |  |
Held to maturity (fair value of $5,097 and $5,563 at December 31, 2023 and December 31, 2022) | 501 | 1,003
Held to maturity, gross unrealized gains | 3 | 7
Held to maturity, gross unrealized losses | 0 | (3)
Securities held to maturity, fair value | $ 504 | $ 1,007

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