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Note 3 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale, maturing within one year, amortized cost | $ 699 |
Available-for-sale, maturing within one year, estimated fair value | 707 |
Held-to-maturity, maturing within one year, amortized cost |  |
Held-to-maturity, maturing within one year, estimated fair value |  |
Available-for-sale, maturing after one to five years, amortized cost | 22,234 |
Available-for-sale, maturing after one to five years, estimated fair value | 21,719 |
Held-to-maturity, maturing after one to five years, amortized cost | 1,827 |
Held-to-maturity, maturing after one to five years, estimated fair value | 1,813 |
Available-for-sale, maturing after five to ten years, amortized cost | 80,332 |
Available-for-sale, maturing after five to ten years, estimated fair value | 78,419 |
Held-to-maturity, maturing after five to ten years, amortized cost | 4,293 |
Held-to-maturity, maturity after five to ten years, estimated fair value | 4,217 |
Available-for-sale, maturing after ten years, amortized cost | 56,873 |
Available-for-sale, maturing after ten years, estimated fair value | 55,797 |
Held-to-maturity, maturing after ten years, amortized cost | 19,180 |
Held-to-maturity, maturing after ten years, estimated fair value | 18,657 |
Available-for-sale, amortized cost | 160,138 | $ 155,473
Available-for-sale, estimated fair value | 156,642 | 153,871
Held-to-maturity, amortized cost | 25,300 | 26,279
Held-to-maturity, estimated fair value | $ 24,687 | $ 25,949

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