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Note 3 - Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Due In One Year or Less, amortized cost | $ 351 |
Due In One Year or Less, fair value | 351 |
Due After One Year Through Five Years, amortized cost | 4,158 |
Due After One Year Through Five Years, fair value | 4,129 |
Due After Five Years Through Ten Years, amortized cost | 1,134 |
Due After Five Years Through Ten Years, fair value | 1,157 |
Due After Ten Years, amortized cost | 1,129 |
Due After Ten Years, fair value | 1,114 |
Amortized cost with single maturity date | 6,772 |
Fair value with single maturity date | 6,751 |
Mortgage-Backed Securities, amortized cost | 357,480 |
Mortgage-Backed Securities, fair value | 351,138 |
Amortized cost | 364,252 | $ 363,433
Fair Value | $ 357,889 | $ 353,066

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