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Note 4 - Investment Securities (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 0 |  | $ 0 |  | $ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | 962,000 |  | 810,000 |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | 0 |  | 0 |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 28,729,000 |  | 31,261,000 |  |
Commercial Paper [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 16,000 | [1] | 16,000 | [2] |
Debt Securities, Available-for-sale, Recorded Value Equal to Fair Value | 19,900,000 |  | 9,900,000 |  |
Residential Mortgage-Backed Securities and Residential Collateralized Mortgage Obligations [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 18,100,000 |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent | 62.80% |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 4,100,000 |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent | 14.30% |  |  |  |
Municipal Bonds [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 3,100,000 |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent | 10.90% |  |  |  |
Commercial Collateralized Mortgage Obligations [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 2,700,000 |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent | 9.30% |  |  |  |
US Government Agencies Debt Securities and SBA Securities [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 760,000 |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent | 2.60% |  |  |  |
Asset Pledged as Collateral [Member] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | $ 95,200,000 |  |  |  |
Asset Pledged as Collateral [Member] | Deposits [Member] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | $ 61,000 |  | $ 76,000 |  |
[1] | The Company held $19.9 million of commercial paper where the recorded value and fair value are equal as of December 31, 2023.
[2] | The Company held $9.9 million of commercial paper where the recorded value and fair value are equal as of December 31, 2022.

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