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Note 4 - Investment Securities - Expected Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Less than one year, Available for sale, Amortized Cost | $ 114,199 | $ 74,577
Less than one year, Available for sale, Estimated Fair Value | 114,233 | 74,598
More than one year to five years, Available for sale, Amortized Cost | 44,937 | 26,622
Available for sale, Estimated Fair Value, More than one year to five years | 45,737 | 26,629
More than five years to ten years, Available for sale, Amortized Cost | 48,462 | 20,518
More than five years to ten years, Available for sale, Estimated Fair Value | 49,107 | 20,812
More than ten years, Available for sale, Amortized Cost | 5,623 | 4,012
More than ten years, Available for sale, Estimated Fair Value | 5,585 | 4,030
Available for sale, amortized cost | 213,221 | 125,729
Available for sale | 214,662 | 126,069
Less than one year, Held to Maturity, Amortized Cost | 979 | 285
Held to maturity, Estimated Fair Value | 998 | 289
More than one year to five years, Held to maturity, Amortized Cost | 1,818 | 2,756
More than one year to five years, Held to Maturity, Estimated Fair Value | 1,955 | 2,824
More than five years to ten years, Held to maturity Amortized Cost | 874 | 870
More than five years to ten years, Held to Maturity, Amortized Cost | 922 | 958
More than ten years, Held to Maturity, Amortized Cost | 3,898 | 4,421
More than ten years, Held to Maturity, Estimated Fair Value | 4,107 | 4,561
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively) | 7,569 | 8,332
Securities held to maturity, fair value | 7,982 | 8,632
US Government Agencies Debt Securities [Member] |  |
Less than one year, Available for sale, Amortized Cost | 0 | 0
Less than one year, Available for sale, Estimated Fair Value | 0 | 0
More than one year to five years, Available for sale, Amortized Cost | 1,258 | 1,591
Available for sale, Estimated Fair Value, More than one year to five years | 1,288 | 1,572
More than five years to ten years, Available for sale, Amortized Cost | 0 | 0
More than five years to ten years, Available for sale, Estimated Fair Value | 0 | 0
More than ten years, Available for sale, Amortized Cost | 0 | 0
More than ten years, Available for sale, Estimated Fair Value | 0 | 0
Available for sale, amortized cost | 1,258 | 1,591
Available for sale | 1,288 | 1,572
Small Business Administration Agency Securities [Member] |  |
Less than one year, Available for sale, Amortized Cost | 0 | 0
Less than one year, Available for sale, Estimated Fair Value | 0 | 0
More than one year to five years, Available for sale, Amortized Cost | 596 | 714
Available for sale, Estimated Fair Value, More than one year to five years | 629 | 725
More than five years to ten years, Available for sale, Amortized Cost | 3,666 | 3,957
More than five years to ten years, Available for sale, Estimated Fair Value | 3,886 | 3,966
More than ten years, Available for sale, Amortized Cost | 0 | 0
More than ten years, Available for sale, Estimated Fair Value | 0 | 0
Available for sale, amortized cost | 4,262 | 4,671
Available for sale | 4,515 | 4,691
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than one year, Available for sale, Amortized Cost | 3,010 | 3,663
Less than one year, Available for sale, Estimated Fair Value | 3,014 | 3,679
More than one year to five years, Available for sale, Amortized Cost | 14,520 | 13,027
Available for sale, Estimated Fair Value, More than one year to five years | 14,804 | 13,059
More than five years to ten years, Available for sale, Amortized Cost | 0 | 2,436
More than five years to ten years, Available for sale, Estimated Fair Value | 0 | 2,433
More than ten years, Available for sale, Amortized Cost | 0 | 0
More than ten years, Available for sale, Estimated Fair Value | 0 | 0
Available for sale, amortized cost | 17,530 | 19,126
Available for sale | 17,818 | 19,171
Collateralized Mortgage Obligations [Member] |  |
Less than one year, Available for sale, Amortized Cost | 0 | 0
Less than one year, Available for sale, Estimated Fair Value | 0 | 0
More than one year to five years, Available for sale, Amortized Cost | 13,895 | 9,288
Available for sale, Estimated Fair Value, More than one year to five years | 14,274 | 9,265
More than five years to ten years, Available for sale, Amortized Cost | 32,053 | 2,353
More than five years to ten years, Available for sale, Estimated Fair Value | 32,062 | 2,389
More than ten years, Available for sale, Amortized Cost | 0 | 0
More than ten years, Available for sale, Estimated Fair Value | 0 | 0
Available for sale, amortized cost | 45,948 | 11,641
Available for sale | 46,336 | 11,654
Commercial Paper [Member] |  |
Less than one year, Available for sale, Amortized Cost | 109,188 |
Less than one year, Available for sale, Estimated Fair Value | 109,188 |
More than one year to five years, Available for sale, Amortized Cost | 0 |
Available for sale, Estimated Fair Value, More than one year to five years | 0 |
More than five years to ten years, Available for sale, Amortized Cost | 0 |
More than five years to ten years, Available for sale, Estimated Fair Value | 0 |
More than ten years, Available for sale, Amortized Cost | 0 |
More than ten years, Available for sale, Estimated Fair Value | 0 |
Available for sale, amortized cost | 109,188 |
Available for sale | 109,188 |
Corporate Debt Securities [Member] |  |
Less than one year, Available for sale, Amortized Cost | 2,001 | 70,914
Less than one year, Available for sale, Estimated Fair Value | 2,031 | 70,919
More than one year to five years, Available for sale, Amortized Cost | 14,668 | 2,002
Available for sale, Estimated Fair Value, More than one year to five years | 14,742 | 2,008
More than five years to ten years, Available for sale, Amortized Cost | 12,743 | 11,772
More than five years to ten years, Available for sale, Estimated Fair Value | 13,159 | 12,024
More than ten years, Available for sale, Amortized Cost | 4,000 | 4,012
More than ten years, Available for sale, Estimated Fair Value | 3,998 | 4,030
Available for sale, amortized cost | 33,412 | 88,700
Available for sale | 33,930 | 88,981
Municipal Bonds [Member] |  |
Less than one year, Available for sale, Amortized Cost | 0 |
Less than one year, Available for sale, Estimated Fair Value | 0 |
More than one year to five years, Available for sale, Amortized Cost | 0 |
Available for sale, Estimated Fair Value, More than one year to five years | 0 |
More than five years to ten years, Available for sale, Amortized Cost | 0 |
More than five years to ten years, Available for sale, Estimated Fair Value | 0 |
More than ten years, Available for sale, Amortized Cost | 1,623 |
More than ten years, Available for sale, Estimated Fair Value | 1,587 |
Available for sale, amortized cost | 1,623 |
Available for sale | 1,587 |
Less than one year, Held to Maturity, Amortized Cost | 0 | 0
Held to maturity, Estimated Fair Value | 0 | 0
More than one year to five years, Held to maturity, Amortized Cost | 0 | 40
More than one year to five years, Held to Maturity, Estimated Fair Value | 0 | 40
More than five years to ten years, Held to maturity Amortized Cost | 874 | 366
More than five years to ten years, Held to Maturity, Amortized Cost | 922 | 379
More than ten years, Held to Maturity, Amortized Cost | 3,898 | 4,421
More than ten years, Held to Maturity, Estimated Fair Value | 4,107 | 4,561
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively) | 4,772 | 4,827
Securities held to maturity, fair value | 5,029 | 4,980
Taxable Municipal Bonds [Member] |  |
Less than one year, Held to Maturity, Amortized Cost | 979 | 285
Held to maturity, Estimated Fair Value | 998 | 289
More than one year to five years, Held to maturity, Amortized Cost | 1,818 | 2,716
More than one year to five years, Held to Maturity, Estimated Fair Value | 1,955 | 2,784
More than five years to ten years, Held to maturity Amortized Cost | 0 | 504
More than five years to ten years, Held to Maturity, Amortized Cost | 0 | 579
More than ten years, Held to Maturity, Amortized Cost | 0 | 0
More than ten years, Held to Maturity, Estimated Fair Value | 0 | 0
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively) | 2,797 | 3,505
Securities held to maturity, fair value | $ 2,953 | $ 3,652

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