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Note 4 - Investment Securities - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale, amortized cost | $ 213,221 | $ 125,729
Available for sale, gross unrealized gains | 1,616 | 435
Available for sale, gross unrealized losses | (175) | (95)
Available for sale | 214,662 | 126,069
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively) | 7,569 | 8,332
Held to maturity, gross unrealized gains | 413 | 300
Held to maturity, gross unrealized losses | 0 | 0
Securities held to maturity, fair value | 7,982 | 8,632
US Government Agencies Debt Securities [Member] |  |
Available for sale, amortized cost | 1,258 | 1,591
Available for sale, gross unrealized gains | 30 | 0
Available for sale, gross unrealized losses | 0 | (19)
Available for sale | 1,288 | 1,572
Small Business Administration Agency Securities [Member] |  |
Available for sale, amortized cost | 4,262 | 4,671
Available for sale, gross unrealized gains | 253 | 42
Available for sale, gross unrealized losses | 0 | (22)
Available for sale | 4,515 | 4,691
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available for sale, amortized cost | 17,530 | 19,126
Available for sale, gross unrealized gains | 294 | 74
Available for sale, gross unrealized losses | (6) | (29)
Available for sale | 17,818 | 19,171
Collateralized Mortgage Obligations [Member] |  |
Available for sale, amortized cost | 45,948 | 11,641
Available for sale, gross unrealized gains | 479 | 38
Available for sale, gross unrealized losses | (91) | (25)
Available for sale | 46,336 | 11,654
Commercial Paper [Member] |  |
Available for sale, amortized cost | 109,188 |
Available for sale, gross unrealized gains | 0 |
Available for sale, gross unrealized losses | 0 |
Available for sale | 109,188 |
Corporate Debt Securities [Member] |  |
Available for sale, amortized cost | 33,412 | 88,700
Available for sale, gross unrealized gains | 560 | 281
Available for sale, gross unrealized losses | (42) | 0
Available for sale | 33,930 | 88,981
Municipal Bonds [Member] |  |
Available for sale, amortized cost | 1,623 |
Available for sale, gross unrealized gains | 0 |
Available for sale, gross unrealized losses | (36) |
Available for sale | 1,587 |
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively) | 4,772 | 4,827
Held to maturity, gross unrealized gains | 257 | 153
Held to maturity, gross unrealized losses | 0 | 0
Securities held to maturity, fair value | 5,029 | 4,980
Taxable Municipal Bonds [Member] |  |
Held to maturity (fair value of $7,982 and $8,632 at September 30, 2020 and December 31, 2019, respectively) | 2,797 | 3,505
Held to maturity, gross unrealized gains | 156 | 147
Held to maturity, gross unrealized losses | 0 | 0
Securities held to maturity, fair value | $ 2,953 | $ 3,652

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