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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost maturity: |  |  |
Securities available for sale, due within one year, amortized cost | $ 19,970 |  |
Securities available for sale, due after one year but within five years, amortized cost | 14,447 |  |
Securities available for sale, due after five years but within ten years, amortized cost | 83,547 |  |
Securities available for sale, due after ten years, amortized cost |  |  |
Securities available for sale, single maturity date, amortized cost | 117,964 |  |
Securities available for sale, amortized cost | 153,477 | $ 164,290 |
Fair value maturity: |  |  |
Securities available for sale, due within one year, fair value | 19,960 |  |
Securities available for sale, due after one year but within five years, fair value | 14,595 |  |
Securities available for sale, due after five years but within ten years, fair value | 83,807 |  |
Securities available for sale, due after ten years, fair value |  |  |
Securities available for sale, single maturity date, fair value | 118,362 |  |
Securities available for sale | 153,116 | 165,525 | [1]
Held-to-maturity, Amortized cost maturity: |  |  |
One year or less, amortized cost | 25,013 |  |
After one year through five years, amortized cost |  |  |
After five years through ten years, amortized cost |  |  |
After ten years, amortized cost |  |  |
Total amortized cost | 25,013 | 25,149 | [1]
Held-to-maturity, Fair value maturity: |  |  |
One year or less | 24,990 |  |
After one year through five years |  |  |
After five years through ten years |  |  |
After ten years |  |  |
Total fair value | 24,990 | 25,084 |
US Government Agencies Debt Securities [Member] |  |  |
Amortized cost maturity: |  |  |
Securities available for sale, due within one year, amortized cost |  |  |
Securities available for sale, due after one year but within five years, amortized cost |  |  |
Securities available for sale, due after five years but within ten years, amortized cost | 1,108 |  |
Securities available for sale, due after ten years, amortized cost |  |  |
Securities available for sale, single maturity date, amortized cost | 1,108 |  |
Securities available for sale, amortized cost | 1,108 | 11,289 |
Fair value maturity: |  |  |
Securities available for sale, due within one year, fair value |  |  |
Securities available for sale, due after one year but within five years, fair value |  |  |
Securities available for sale, due after five years but within ten years, fair value | 1,113 |  |
Securities available for sale, due after ten years, fair value |  |  |
Securities available for sale, single maturity date, fair value | 1,113 |  |
Securities available for sale | 1,113 | 11,296 |
Held-to-maturity, Amortized cost maturity: |  |  |
One year or less, amortized cost | 17,887 |  |
After one year through five years, amortized cost |  |  |
After five years through ten years, amortized cost |  |  |
After ten years, amortized cost |  |  |
Total amortized cost | 17,887 | 17,937 |
Held-to-maturity, Fair value maturity: |  |  |
One year or less | 17,867 |  |
After one year through five years |  |  |
After five years through ten years |  |  |
After ten years |  |  |
Total fair value | 17,867 | 17,888 |
US Treasury Securities [Member] |  |  |
Amortized cost maturity: |  |  |
Securities available for sale, due within one year, amortized cost | 19,970 |  |
Securities available for sale, due after one year but within five years, amortized cost |  |  |
Securities available for sale, due after five years but within ten years, amortized cost |  |  |
Securities available for sale, due after ten years, amortized cost |  |  |
Securities available for sale, single maturity date, amortized cost | 19,970 |  |
Securities available for sale, amortized cost | 19,970 | 19,987 |
Fair value maturity: |  |  |
Securities available for sale, due within one year, fair value | 19,960 |  |
Securities available for sale, due after one year but within five years, fair value |  |  |
Securities available for sale, due after five years but within ten years, fair value |  |  |
Securities available for sale, due after ten years, fair value |  |  |
Securities available for sale, single maturity date, fair value | 19,960 |  |
Securities available for sale | 19,960 | 19,971 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost maturity: |  |  |
Securities available for sale, due within one year, amortized cost |  |  |
Securities available for sale, due after one year but within five years, amortized cost | 14,447 |  |
Securities available for sale, due after five years but within ten years, amortized cost | 82,439 |  |
Securities available for sale, due after ten years, amortized cost |  |  |
Securities available for sale, single maturity date, amortized cost | 96,886 |  |
Securities available for sale, amortized cost | 96,886 | 101,552 |
Fair value maturity: |  |  |
Securities available for sale, due within one year, fair value |  |  |
Securities available for sale, due after one year but within five years, fair value | 14,595 |  |
Securities available for sale, due after five years but within ten years, fair value | 82,694 |  |
Securities available for sale, due after ten years, fair value |  |  |
Securities available for sale, single maturity date, fair value | 97,289 |  |
Securities available for sale | 97,289 | 103,648 |
Corporate Debt Securities [Member] |  |  |
Held-to-maturity, Amortized cost maturity: |  |  |
One year or less, amortized cost | 7,126 |  |
After one year through five years, amortized cost |  |  |
After five years through ten years, amortized cost |  |  |
After ten years, amortized cost |  |  |
Total amortized cost | 7,126 | 7,212 |
Held-to-maturity, Fair value maturity: |  |  |
One year or less | 7,123 |  |
After one year through five years |  |  |
After five years through ten years |  |  |
After ten years |  |  |
Total fair value | 7,123 | $ 7,196 |
Collateralized Mortgage Backed Securities [Member] |  |  |
Amortized cost maturity: |  |  |
Securities available for sale, no single maturity date, amortized cost | 35,513 |  |
Fair value maturity: |  |  |
Securities available for sale, no single maturity date, fair value | $ 34,754 |  |
[1] | Derived from audited financial statements

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