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Note 7 - Fair Value - Financial Assets At Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities | $ 158,425 | $ 210,338
Certificates of Deposit [Member] |  |
Securities | 2,725 | 2,233
US States and Political Subdivisions Debt Securities [Member] |  |
Securities | 229 | 225
US Treasury and Government [Member] |  |
Securities | 123,095 |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities | 27,863 | 39,699
Residential Mortgage-Backed Securities [Member] |  |
Securities | 3,480 | 3,881
Collateralized Mortgage-Backed Securities [Member] |  |
Securities | 1,033 | 1,197
US Treasury Securities [Member] |  |
Securities | 123,095 | 163,103
Fair Value, Inputs, Level 1 [Member] |  |
Securities | 123,095 | 163,103
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member] |  |
Securities | 123,095 |
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Securities |  | 163,103
Fair Value, Inputs, Level 2 [Member] |  |
Securities | 35,330 | 47,235
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Securities | 2,725 | 2,233
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities | 229 | 225
Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member] |  |
Securities | 0 |
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities | 27,863 | 39,699
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Securities | 3,480 | 3,881
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities | 1,033 | 1,197
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Securities |  | 0
Fair Value, Inputs, Level 3 [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member] |  |
Securities | 0 |
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities | $ 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |
Securities |  | $ 0

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