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Note 4 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Available-for-sale, amortized cost | $ 129,232 | $ 135,656 |
Available-for-sale, gross unrealized gains | 258 | 174 |
Available-for-sale, gross unrealized losses | (2,305) | (3,343) |
Available-for-sale, estimated fair value | 127,185 | 132,487 |
Held-to-maturity, amortized cost | 20,840 | 21,462 | $ 20,840
Held-to-maturity, gross unrealized gains |  |  | 6
Held-to-maturity, gross unrealized losses |  | (610) | (379)
Held-to-maturity, estimated fair value | 20,467 | 20,852 | 20,467
Commercial Mortgage Backed Securities [Member] |  |  |
Available-for-sale, amortized cost | 52,786 | 56,101 |
Available-for-sale, gross unrealized gains | 11 | 10 |
Available-for-sale, gross unrealized losses | (1,276) | (1,822) |
Available-for-sale, estimated fair value | 51,521 | 54,289 |
Held-to-maturity, amortized cost |  | 11,716 | 11,143
Held-to-maturity, gross unrealized gains |  |  |
Held-to-maturity, gross unrealized losses |  | (349) | (229)
Held-to-maturity, estimated fair value |  | 11,367 | 10,914
US Government Agencies Debt Securities [Member] |  |  |
Held-to-maturity, amortized cost |  | 8,026 | 8,010
Held-to-maturity, gross unrealized gains |  |  |
Held-to-maturity, gross unrealized losses |  | (244) | (145)
Held-to-maturity, estimated fair value |  | 7,782 | 7,865
Residential Mortgage Backed Securities [Member] |  |  |
Available-for-sale, amortized cost | 70,759 | 73,859 |
Available-for-sale, gross unrealized gains | 173 | 113 |
Available-for-sale, gross unrealized losses | (1,027) | (1,517) |
Available-for-sale, estimated fair value | 69,905 | 72,455 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale, amortized cost | 5,608 | 5,617 |
Available-for-sale, gross unrealized gains | 74 | 51 |
Available-for-sale, gross unrealized losses | (1) | (4) |
Available-for-sale, estimated fair value | 5,681 | 5,664 |
Held-to-maturity, amortized cost |  | 1,720 | 1,687
Held-to-maturity, gross unrealized gains |  |  | 6
Held-to-maturity, gross unrealized losses |  | (17) | (5)
Held-to-maturity, estimated fair value |  | 1,703 | $ 1,688
US Treasury Securities [Member] |  |  |
Available-for-sale, amortized cost | 79 | 79 |
Available-for-sale, gross unrealized gains |  |  |
Available-for-sale, gross unrealized losses | (1) |  |
Available-for-sale, estimated fair value | $ 78 | $ 79 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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