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Note 3 - Investment Securities - Schedule of Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
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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