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Note 2 - Securities Available for Sale - Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Less than 12 Months, Fair Value | $ 565 | $ 279
Less than 12 Months, Unrealized Losses | 9 | 1
12 Months or Longer, Fair Value | 77,264 | 81,361
12 Months or Longer, Unrealized Losses | 12,263 | 11,502
Total, Fair Value | 77,829 | 81,640
Total, Unrealized Losses | 12,272 | 11,503
US Government Agencies Debt Securities [Member] |  |
Less than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 8,803 | 9,106
12 Months or Longer, Unrealized Losses | 1,193 | 1,128
Total, Fair Value | 8,803 | 9,106
Total, Unrealized Losses | 1,193 | 1,128
Municipal Bonds [Member] |  |
Less than 12 Months, Fair Value | 565 | 279
Less than 12 Months, Unrealized Losses | 9 | 1
12 Months or Longer, Fair Value | 12,352 | 12,796
12 Months or Longer, Unrealized Losses | 2,042 | 1,881
Total, Fair Value | 12,917 | 13,075
Total, Unrealized Losses | 2,051 | 1,882
Residential Mortgage-Backed Securities [Member] |  |
Less than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 28,966 | 30,351
12 Months or Longer, Unrealized Losses | 4,876 | 4,533
Total, Fair Value | 28,966 | 30,351
Total, Unrealized Losses | 4,876 | 4,533
Collateralized Mortgage-Backed Securities [Member] |  |
Less than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 25,651 | 26,135
12 Months or Longer, Unrealized Losses | 4,144 | 3,938
Total, Fair Value | 25,651 | 26,135
Total, Unrealized Losses | $ 4,144 | $ 3,938

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