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Note 3 - Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | December 31, 2020 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 555 |  |  | $ | — |  |  | $ | (4 | ) |  | $ | 551 |
Municipal securities |  |  | 43,950 |  |  |  | 509 |  |  |  | — |  |  |  | 44,459 |
Mortgage-backed Agency securities |  |  | 37,453 |  |  |  | 992 |  |  |  | (97 | ) |  |  | 38,348 |
Total |  | $ | 81,958 |  |  | $ | 1,501 |  |  | $ | (101 | ) |  | $ | 83,358 |
|  | December 31, 2019 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 5,038 |  |  | $ | — |  |  | $ | (4 | ) |  | $ | 5,034 |
Municipal securities |  |  | 85,992 |  |  |  | 886 |  |  |  | — |  |  |  | 86,878 |
Mortgage-backed Agency securities |  |  | 77,448 |  |  |  | 380 |  |  |  | (166 | ) |  |  | 77,662 |
Total |  | $ | 168,478 |  |  | $ | 1,266 |  |  | $ | (170 | ) |  | $ | 169,574 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
(Amounts in thousands) |  | U.S. Agency Securities |  |  | Municipal Securities |  |  | Total |
Amortized cost maturity: |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | — |  |  | $ | — |  |  | $ | — |
After one year through five years |  |  | — |  |  |  | 24,485 |  |  |  | 24,485 |
After five years through ten years |  |  | 555 |  |  |  | 19,465 |  |  |  | 20,020 |
After ten years |  |  | — |  |  |  | — |  |  |  | — |
Amortized cost |  | $ | 555 |  |  | $ | 43,950 |  |  |  | 44,505 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  | 37,453 |
Total amortized cost |  |  |  |  |  |  |  |  |  | $ | 81,958 |
Fair value maturity: |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | — |  |  | $ | — |  |  | $ | — |
After one year through five years |  |  | — |  |  |  | 24,703 |  |  |  | 24,703 |
After five years through ten years |  |  | 551 |  |  |  | 19,756 |  |  |  | 20,307 |
After ten years |  |  | — |  |  |  | — |  |  |  | — |
Fair value |  | $ | 551 |  |  | $ | 44,459 |  |  |  | 45,010 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  | 38,348 |
Total fair value |  |  |  |  |  |  |  |  |  | $ | 83,358 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] |
|  | December 31, 2020 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | — |  |  | $ | — |  |  | $ | 544 |  |  | $ | (4 | ) |  | $ | 544 |  |  | $ | (4 | )
Municipal securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Mortgage-backed Agency securities |  |  | 11,018 |  |  |  | (97 | ) |  |  | — |  |  |  | — |  |  |  | 11,018 |  |  |  | (97 | )
Total |  | $ | 11,018 |  |  | $ | (97 | ) |  | $ | 544 |  |  | $ | (4 | ) |  | $ | 11,562 |  |  | $ | (101 | )
|  | December 31, 2019 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 975 |  |  | $ | (4 | ) |  | $ | — |  |  | $ | — |  |  | $ | 975 |  |  | $ | (4 | )
Municipal securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Mortgage-backed Agency securities |  |  | 8,020 |  |  |  | (48 | ) |  |  | 8,319 |  |  |  | (118 | ) |  |  | 16,339 |  |  |  | (166 | )
Total |  | $ | 8,995 |  |  | $ | (52 | ) |  | $ | 8,319 |  |  | $ | (118 | ) |  | $ | 17,314 |  |  | $ | (170 | )
Realized Gain (Loss) on Investments [Table Text Block] |
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  | $ | 419 |  |  | $ | 67 |  |  | $ | — |
Gross realized losses |  |  | (34 | ) |  |  | (110 | ) |  |  | (618 | )
Net gain (loss) on sale of securities |  | $ | 385 |  |  | $ | (43 | ) |  | $ | (618 | )

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