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Note 3 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale, maturing within one year, amortized cost | $ 234 |
Available-for-sale, maturing within one year, estimated fair value | 235 |
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 | 33,949 |
Available-for-sale, maturing after one to five years, estimated fair value | 33,267 |
Held-to-maturity, maturing after one to five years, amortized cost | 1,766 |
Held-to-maturity, maturing after one to five years, estimated fair value | 1,750 |
Available-for-sale, maturing after five to ten years, amortized cost | 64,634 |
Available-for-sale, maturing after five to ten years, estimated fair value | 62,494 |
Held-to-maturity, maturing after five to ten years, amortized cost | 6,168 |
Held-to-maturity, maturity after five to ten years, estimated fair value | 6,024 |
Available-for-sale, maturing after ten years, amortized cost | 46,498 |
Available-for-sale, maturing after ten years, estimated fair value | 45,425 |
Held-to-maturity, maturing after ten years, amortized cost | 16,385 |
Held-to-maturity, maturing after ten years, estimated fair value | 15,841 |
Available-for-sale, amortized cost | 145,315 | $ 155,473
Available-for-sale, estimated fair value | 141,421 | 153,871
Held-to-maturity, amortized cost | 24,319 | 26,279
Held-to-maturity, estimated fair value | $ 23,615 | $ 25,949

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