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Note 3 - Investment Securities - Schedule of Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,982 | $ 2,274
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6 | 26
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 260,205 | 273,213
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 19,907 | 28,181
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | 0 | 6,012
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | 0 | 476
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 14,690 | 8,941
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,065 | 712
US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,982 | 0
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 63,590 | 68,202
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,139 | 6,202
US Government Corporations and Agencies Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 83,308 | 80,901
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,360 | 8,077
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 734
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 16
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,862 | 5,800
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 588 | 900
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 68,025 | 72,287
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7,090 | 8,846
Nontaxable Municipal Bonds [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 1,540
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 10
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,374 | 5,631
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 222 | 235
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | 0 | 6,012
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | 0 | 476
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 11,707 | 5,975
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 765 | 396
Taxable Municipal Bonds [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 34,046 | 40,392
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,508 | 3,921
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | 0 | 0
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss | 0 | 0
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 2,983 | 2,966
Debt Security, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 300 | $ 316

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