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Note 4 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Available for Sale Securities, and Held to Maturity [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
September 30, 2020 |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | 1,258 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 1,288 |
SBA agency securities |  |  | 4,262 |  |  |  | 253 |  |  |  | — |  |  |  | 4,515 |
Mortgage-backed securities- Government sponsored agencies |  |  | 17,530 |  |  |  | 294 |  |  |  | (6 | ) |  |  | 17,818 |
Collateralized mortgage obligations |  |  | 45,948 |  |  |  | 479 |  |  |  | (91 | ) |  |  | 46,336 |
Commercial paper |  |  | 109,188 |  |  |  | — |  |  |  | — |  |  |  | 109,188 |
Corporate debt securities |  |  | 33,412 |  |  |  | 560 |  |  |  | (42 | ) |  |  | 33,930 |
Municipal securities |  |  | 1,623 |  |  |  | — |  |  |  | (36 | ) |  |  | 1,587 |
Total |  | $ | 213,221 |  |  | $ | 1,616 |  |  | $ | (175 | ) |  | $ | 214,662 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal taxable securities |  | $ | 2,797 |  |  | $ | 156 |  |  | $ | — |  |  | $ | 2,953 |
Municipal securities |  |  | 4,772 |  |  |  | 257 |  |  |  | — |  |  |  | 5,029 |
Total |  | $ | 7,569 |  |  | $ | 413 |  |  | $ | — |  |  | $ | 7,982 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | 1,591 |  |  | $ | — |  |  | $ | (19 | ) |  | $ | 1,572 |
SBA agency securities |  |  | 4,671 |  |  |  | 42 |  |  |  | (22 | ) |  |  | 4,691 |
Mortgage-backed securities- Government sponsored agencies |  |  | 19,126 |  |  |  | 74 |  |  |  | (29 | ) |  |  | 19,171 |
Collateralized mortgage obligations |  |  | 11,641 |  |  |  | 38 |  |  |  | (25 | ) |  |  | 11,654 |
Corporate debt securities |  |  | 88,700 |  |  |  | 281 |  |  |  | — |  |  |  | 88,981 |
Total |  | $ | 125,729 |  |  | $ | 435 |  |  | $ | (95 | ) |  | $ | 126,069 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal taxable securities |  | $ | 3,505 |  |  | $ | 147 |  |  | $ | — |  |  | $ | 3,652 |
Municipal securities |  |  | 4,827 |  |  |  | 153 |  |  |  | — |  |  |  | 4,980 |
Total |  | $ | 8,332 |  |  | $ | 300 |  |  | $ | — |  |  | $ | 8,632 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Less than One Year |  | More than One Year to Five Years |  | More than Five Years to Ten Years |  | More than Ten Years |  | Total |
|  | Amortized |  | Estimated |  | Amortized |  | Estimated |  | Amortized |  | Estimated |  | Amortized |  | Estimated |  | Amortized |  | Estimated |
(dollars in thousands) |  | Cost |  | Fair Value |  | Cost |  | Fair Value |  | Cost |  | Fair Value |  | Cost |  | Fair Value |  | Cost |  | Fair Value |
September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | — |  | $ | — |  | $ | 1,258 |  | $ | 1,288 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 1,258 |  | $ | 1,288 |
SBA securities |  |  | — |  |  | — |  |  | 596 |  |  | 629 |  |  | 3,666 |  |  | 3,886 |  |  | — |  |  | — |  |  | 4,262 |  |  | 4,515 |
Mortgage-backed securities- Government sponsored agencies |  |  | 3,010 |  |  | 3,014 |  |  | 14,520 |  |  | 14,804 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 17,530 |  |  | 17,818 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  | 13,895 |  |  | 14,274 |  |  | 32,053 |  |  | 32,062 |  |  | — |  |  | — |  |  | 45,948 |  |  | 46,336 |
Commercial paper |  |  | 109,188 |  |  | 109,188 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 109,188 |  |  | 109,188 |
Corporate debt securities |  |  | 2,001 |  |  | 2,031 |  |  | 14,668 |  |  | 14,742 |  |  | 12,743 |  |  | 13,159 |  |  | 4,000 |  |  | 3,998 |  |  | 33,412 |  |  | 33,930 |
Municipal securities |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,623 |  |  | 1,587 |  |  | 1,623 |  |  | 1,587 |
Total available for sale |  | $ | 114,199 |  | $ | 114,233 |  | $ | 44,937 |  | $ | 45,737 |  | $ | 48,462 |  | $ | 49,107 |  | $ | 5,623 |  | $ | 5,585 |  | $ | 213,221 |  | $ | 214,662 |
Municipal taxable securities |  | $ | 979 |  | $ | 998 |  | $ | 1,818 |  | $ | 1,955 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 2,797 |  | $ | 2,953 |
Municipal securities |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 874 |  |  | 922 |  |  | 3,898 |  |  | 4,107 |  |  | 4,772 |  |  | 5,029 |
Total held to maturity |  | $ | 979 |  | $ | 998 |  | $ | 1,818 |  | $ | 1,955 |  | $ | 874 |  | $ | 922 |  | $ | 3,898 |  | $ | 4,107 |  | $ | 7,569 |  | $ | 7,982 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | — |  | $ | — |  | $ | 1,591 |  | $ | 1,572 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 1,591 |  | $ | 1,572 |
SBA securities |  |  | — |  |  | — |  |  | 714 |  |  | 725 |  |  | 3,957 |  |  | 3,966 |  |  | — |  |  | — |  |  | 4,671 |  |  | 4,691 |
Mortgage-backed securities- Government sponsored agencies |  |  | 3,663 |  |  | 3,679 |  |  | 13,027 |  |  | 13,059 |  |  | 2,436 |  |  | 2,433 |  |  | — |  |  | — |  |  | 19,126 |  |  | 19,171 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  | 9,288 |  |  | 9,265 |  |  | 2,353 |  |  | 2,389 |  |  | — |  |  | — |  |  | 11,641 |  |  | 11,654 |
Corporate debt securities |  |  | 70,914 |  |  | 70,919 |  |  | 2,002 |  |  | 2,008 |  |  | 11,772 |  |  | 12,024 |  |  | 4,012 |  |  | 4,030 |  |  | 88,700 |  |  | 88,981 |
Total available for sale |  | $ | 74,577 |  | $ | 74,598 |  | $ | 26,622 |  | $ | 26,629 |  | $ | 20,518 |  | $ | 20,812 |  | $ | 4,012 |  | $ | 4,030 |  | $ | 125,729 |  | $ | 126,069 |
Municipal taxable securities |  | $ | 285 |  | $ | 289 |  | $ | 2,716 |  | $ | 2,784 |  | $ | 504 |  | $ | 579 |  | $ | — |  | $ | — |  | $ | 3,505 |  | $ | 3,652 |
Municipal securities |  |  | — |  |  | — |  |  | 40 |  |  | 40 |  |  | 366 |  |  | 379 |  |  | 4,421 |  |  | 4,561 |  |  | 4,827 |  |  | 4,980 |
Total held to maturity |  | $ | 285 |  | $ | 289 |  | $ | 2,756 |  | $ | 2,824 |  | $ | 870 |  | $ | 958 |  | $ | 4,421 |  | $ | 4,561 |  | $ | 8,332 |  | $ | 8,632 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Less than Twelve Months |  | Twelve Months or More |  | Total |
|  | Unrealized |  | Estimated |  | No. of |  | Unrealized |  | Estimated |  | No. of |  | Unrealized |  | Estimated |  | No. of |
(dollars in thousands) |  | Losses |  | Fair Value |  | Issuances |  | Losses |  | Fair Value |  | Issuances |  | Losses |  | Fair Value |  | Issuances |
September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities- Government sponsored agencies |  |  | (6 | ) |  | 9,998 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | (6 | ) |  | 9,998 |  |  | 2 |
Collateralized mortgage obligations |  |  | (91 | ) |  | 29,260 |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  | (91 | ) |  | 29,260 |  |  | 6 |
Corporate debt securities |  |  | (42 | ) |  | 5,958 |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | (42 | ) |  | 5,958 |  |  | 4 |
Municipal securities |  |  | (36 | ) |  | 1,587 |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  | (36 | ) |  | 1,587 |  |  | 3 |
Total available for sale |  | $ | (175 | ) | $ | 46,803 |  |  | 15 |  | $ | — |  | $ | — |  |  | — |  | $ | (175 | ) | $ | 46,803 |  | $ | 15 |
Total held to maturity |  | $ | — |  | $ | — |  |  | — |  | $ | — |  | $ | — |  |  | — |  | $ | — |  | $ | — |  |  | — |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | (19 | ) | $ | 1,572 |  |  | 2 |  | $ | — |  | $ | — |  |  | — |  | $ | (19 | ) | $ | 1,572 |  |  | 2 |
SBA securities |  |  | (22 | ) |  | 1,469 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | (22 | ) |  | 1,469 |  |  | 2 |
Mortgage-backed securities- Government sponsored agencies |  |  | (5 | ) |  | 2,631 |  |  | 4 |  |  | (24 | ) |  | 3,912 |  |  | 6 |  |  | (29 | ) |  | 6,543 |  |  | 10 |
Collateralized mortgage obligations |  |  | (10 | ) |  | 5,738 |  |  | 3 |  |  | (15 | ) |  | 953 |  |  | 2 |  |  | (25 | ) |  | 6,691 |  |  | 5 |
Total available for sale |  | $ | (56 | ) | $ | 11,410 |  |  | 11 |  | $ | (39 | ) | $ | 4,865 |  |  | 8 |  | $ | (95 | ) | $ | 16,275 |  |  | 19 |
Total held to maturity |  | $ | — |  | $ | — |  |  | — |  | $ | — |  | $ | — |  |  | — |  | $ | — |  | $ | — |  |  | — |

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