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Note 4 - Investment Securities - Summary of Investment Securities With Unrealized Losses (Details) $ in Thousands | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Less than Twelve Months Unrealized Losses, available for sale | $ (175) | $ (56)
Less than Twelve Months Estimated Fair Value, available for sale | $ 46,803 | $ 11,410
Available for sale, Total No. of Issuances, less than twelve months | 15 | 11
Twelve Months or More Unrealized Losses | $ 0 | $ 39
Twelve Months or More Estimated Fair Value, available for sale | $ 0 | $ 4,865
Twelve Months or More No. of Issuances, available for sale | 0 | 8
Total Unrealized Losses, available for sale | $ (175) | $ (95)
Total Estimated Fair Value, available for sale | $ 46,803 | $ 16,275
Available for sale, Total No. of Issuances | 15 | 19
Available for sale, Total No. of Issuances | 15 | 19
Less than Twelve Months Unrealized Losses, held to maturity | $ 0 | $ 0
Less than Twelve Months Estimated Fair Value, held to maturity | $ 0 | $ 0
Held to maturity, Total No. of Issuances, less than twelve months | 0 | 0
Twelve Months or More Unrealized Losses, held to maturity | $ 0 | $ 0
Twelve Months or More Estimated Fair Value, held to maturity | $ 0 | $ 0
Twelve Months or More No. of Issuances, held to maturity | 0 | 0
Total Unrealized Losses, held to maturity | $ 0 | $ 0
Total Estimated Fair Value, held to maturity | $ 0 | $ 0
Held to maturity, Total No. of Issuances | 0 | 0
Twelve Months or More Unrealized Losses | $ 0 | $ (39)
Held to maturity, Total No. of Issuances | 0 | 0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than Twelve Months Unrealized Losses, available for sale | $ (6) | $ (5)
Less than Twelve Months Estimated Fair Value, available for sale | $ 9,998 | $ 2,631
Available for sale, Total No. of Issuances, less than twelve months | 2 | 4
Twelve Months or More Unrealized Losses | $ 0 | $ 24
Twelve Months or More Estimated Fair Value, available for sale | $ 0 | $ 3,912
Twelve Months or More No. of Issuances, available for sale | 0 | 6
Total Unrealized Losses, available for sale | $ (6) | $ (29)
Total Estimated Fair Value, available for sale | $ 9,998 | $ 6,543
Available for sale, Total No. of Issuances | 2 | 10
Available for sale, Total No. of Issuances | 2 | 10
Twelve Months or More Unrealized Losses | $ 0 | $ (24)
Collateralized Mortgage Obligations [Member] |  |
Less than Twelve Months Unrealized Losses, available for sale | (91) | (10)
Less than Twelve Months Estimated Fair Value, available for sale | $ 29,260 | $ 5,738
Available for sale, Total No. of Issuances, less than twelve months | 6 | 3
Twelve Months or More Unrealized Losses |  | $ 15
Twelve Months or More Estimated Fair Value, available for sale |  | $ 953
Twelve Months or More No. of Issuances, available for sale |  | 2
Total Unrealized Losses, available for sale | $ (91) | $ (25)
Total Estimated Fair Value, available for sale | $ 29,260 | $ 6,691
Available for sale, Total No. of Issuances | 6 | 5
Available for sale, Total No. of Issuances | 6 | 5
Twelve Months or More Unrealized Losses |  | $ (15)
Corporate Debt Securities [Member] |  |
Less than Twelve Months Unrealized Losses, available for sale | (42) |
Less than Twelve Months Estimated Fair Value, available for sale | $ 5,958 |
Available for sale, Total No. of Issuances, less than twelve months | 4 |
Twelve Months or More Unrealized Losses | $ 0 |
Twelve Months or More Estimated Fair Value, available for sale | $ 0 |
Twelve Months or More No. of Issuances, available for sale | 0 |
Total Unrealized Losses, available for sale | $ (42) |
Total Estimated Fair Value, available for sale | $ 5,958 |
Available for sale, Total No. of Issuances | 4 |
Available for sale, Total No. of Issuances | 4 |
Twelve Months or More Unrealized Losses | $ 0 |
Municipal Bonds [Member] |  |
Less than Twelve Months Unrealized Losses, available for sale | (36) |
Less than Twelve Months Estimated Fair Value, available for sale | $ 1,587 |
Available for sale, Total No. of Issuances, less than twelve months | 3 |
Twelve Months or More Unrealized Losses |  |
Twelve Months or More Estimated Fair Value, available for sale |  |
Twelve Months or More No. of Issuances, available for sale |  |
Total Unrealized Losses, available for sale | $ (36) |
Total Estimated Fair Value, available for sale | $ 1,587 |
Available for sale, Total No. of Issuances | 3 |
Available for sale, Total No. of Issuances | 3 |
Twelve Months or More Unrealized Losses |  |
US Government Agencies Debt Securities [Member] |  |
Less than Twelve Months Unrealized Losses, available for sale |  | (19)
Less than Twelve Months Estimated Fair Value, available for sale |  | $ 1,572
Available for sale, Total No. of Issuances, less than twelve months |  | 2
Twelve Months or More Unrealized Losses |  | $ 0
Twelve Months or More Estimated Fair Value, available for sale |  | $ 0
Twelve Months or More No. of Issuances, available for sale |  | 0
Total Unrealized Losses, available for sale |  | $ (19)
Total Estimated Fair Value, available for sale |  | $ 1,572
Available for sale, Total No. of Issuances |  | 2
Available for sale, Total No. of Issuances |  | 2
Twelve Months or More Unrealized Losses |  | $ 0
Small Business Administration Agency Securities [Member] |  |
Less than Twelve Months Unrealized Losses, available for sale |  | (22)
Less than Twelve Months Estimated Fair Value, available for sale |  | $ 1,469
Available for sale, Total No. of Issuances, less than twelve months |  | 2
Twelve Months or More Unrealized Losses |  | $ 0
Twelve Months or More Estimated Fair Value, available for sale |  | $ 0
Twelve Months or More No. of Issuances, available for sale |  | 0
Total Unrealized Losses, available for sale |  | $ (22)
Total Estimated Fair Value, available for sale |  | $ 1,469
Available for sale, Total No. of Issuances |  | 2
Available for sale, Total No. of Issuances |  | 2
Twelve Months or More Unrealized Losses |  | $ 0

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