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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Due in one year or less, amortized cost | $ 49,388 |
Due in one year or less, fair value | 49,389 |
Due after one year through five years, amortized cost | 404 |
Due after one year through five years, fair value | 413 |
Amortized cost, single maturity date | 49,792 |
Fair value, single maturity date | 49,802 |
Amortized cost | 59,117 | $ 59,884
Fair value | 59,437 | 60,193
Residential Mortgage Backed Securities [Member] |  |
Amortized cost, without single maturity date | 6,668 |
Fair value, without single maturity date | 6,983 |
Amortized cost | 6,668 | 7,727
Fair value | 6,983 | 8,037
Collateralized Mortgage Backed Securities [Member] |  |
Amortized cost, without single maturity date | 2,657 |
Fair value, without single maturity date | 2,652 |
Amortized cost | 2,657 | 2,986
Fair value | $ 2,652 | $ 2,977

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