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Note 4 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale, amortized cost | $ 141,100 | $ 155,473
Available-for-sale, gross unrealized gains | 191 | 495
Available-for-sale, gross unrealized losses | (4,033) | (2,097)
Available-for-sale, estimated fair value | 137,258 | 153,871
Held-to-maturity, amortized cost | 22,238 | 26,279
Held-to-maturity, gross unrealized gains |  | 13
Held-to-maturity, gross unrealized losses | (759) | (343)
Held-to-maturity, estimated fair value | 21,479 | 25,949
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale, amortized cost | 59,796 | 67,281
Available-for-sale, gross unrealized gains | 11 | 27
Available-for-sale, gross unrealized losses | (2,091) | (1,234)
Available-for-sale, estimated fair value | 57,716 | 66,074
Held-to-maturity, amortized cost | 12,357 | 15,065
Held-to-maturity, gross unrealized gains |  | 1
Held-to-maturity, gross unrealized losses | (408) | (186)
Held-to-maturity, estimated fair value | 11,949 | 14,880
US Government Agencies Debt Securities [Member] |  |
Held-to-maturity, amortized cost | 8,126 | 9,326
Held-to-maturity, gross unrealized gains |  | 7
Held-to-maturity, gross unrealized losses | (323) | (144)
Held-to-maturity, estimated fair value | 7,803 | 9,189
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale, amortized cost | 76,064 | 83,360
Available-for-sale, gross unrealized gains | 144 | 286
Available-for-sale, gross unrealized losses | (1,897) | (860)
Available-for-sale, estimated fair value | 74,311 | 82,786
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale, amortized cost | 5,160 | 4,752
Available-for-sale, gross unrealized gains | 36 | 182
Available-for-sale, gross unrealized losses | (45) | (3)
Available-for-sale, estimated fair value | 5,151 | 4,931
Held-to-maturity, amortized cost | 1,755 | 1,888
Held-to-maturity, gross unrealized gains |  | 5
Held-to-maturity, gross unrealized losses | (28) | (13)
Held-to-maturity, estimated fair value | 1,727 | 1,880
US Treasury Securities [Member] |  |
Available-for-sale, amortized cost | 80 | 80
Available-for-sale, gross unrealized gains |  |
Available-for-sale, gross unrealized losses |  |
Available-for-sale, estimated fair value | $ 80 | $ 80

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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=82897076&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=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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