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Note 4 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details) $ in Thousands | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Collateralized mortgage obligations and residential mortgage-backed securities | $ 28,423 | $ 13,226
Unrealized losses, less than 12 months | (326) | (76)
Estimated fair value, 12 months or longer | 879 | 16,141
Unrealized losses, 12 months or longer | (1,307) | (1,191)
Estimated fair value, total | 29,302 | 29,367
Collateralized mortgage obligations and residential mortgage-backed securities | $ (1,633) | $ (1,267)
Unrealized losses, less than 12 months, number of securities | 32 | 11
Unrealized losses, 12 months or longer, number of securities | 2 | 17
Unrealized losses, total, number of securities | 34 | 28
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Collateralized mortgage obligations and residential mortgage-backed securities | $ 6,096 | $ 8,859
Unrealized losses, less than 12 months | (23) | (31)
Estimated fair value, 12 months or longer | 0 | 15,065
Unrealized losses, 12 months or longer | 0 | (65)
Estimated fair value, total | 6,096 | 23,924
Collateralized mortgage obligations and residential mortgage-backed securities | (23) | (96)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Collateralized mortgage obligations and residential mortgage-backed securities | 4,989 | 0
Unrealized losses, less than 12 months | (9) | 0
Estimated fair value, 12 months or longer | 0 | 0
Unrealized losses, 12 months or longer | 0 | 0
Estimated fair value, total | 4,989 | 0
Collateralized mortgage obligations and residential mortgage-backed securities | (9) | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Collateralized mortgage obligations and residential mortgage-backed securities | 17,338 | 4,367
Unrealized losses, less than 12 months | (294) | (45)
Estimated fair value, 12 months or longer | 0 | 0
Unrealized losses, 12 months or longer | 0 | 0
Estimated fair value, total | 17,338 | 4,367
Collateralized mortgage obligations and residential mortgage-backed securities | (294) | (45)
Collateralized Debt Obligations [Member] |  |
Collateralized mortgage obligations and residential mortgage-backed securities | 0 | 0
Unrealized losses, less than 12 months | 0 | 0
Estimated fair value, 12 months or longer | 879 | 1,076
Unrealized losses, 12 months or longer | (1,307) | (1,126)
Estimated fair value, total | 879 | 1,076
Collateralized mortgage obligations and residential mortgage-backed securities | $ (1,307) | $ (1,126)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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