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Note 3 - Securities (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available-for-Sale Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 32,724 |  |  | $ | — |  |  | $ | — |  |  | $ | 32,724 |
Municipal securities |  |  | 503 |  |  |  | 9 |  |  |  | — |  |  |  | 512 |
Mortgage-backed securities - residential |  |  | 6,124 |  |  |  | 305 |  |  |  | — |  |  |  | 6,429 |
Collateralized mortgage obligations - residential |  |  | 2,381 |  |  |  | 4 |  |  |  | (2 | ) |  |  | 2,383 |
|  | $ | 41,732 |  |  | $ | 318 |  |  | $ | (2 | ) |  | $ | 42,048 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 48,666 |  |  | $ | — |  |  | $ | — |  |  | $ | 48,666 |
Municipal securities |  |  | 505 |  |  |  | 8 |  |  |  | — |  |  |  | 513 |
Mortgage-backed securities - residential |  |  | 7,727 |  |  |  | 310 |  |  |  | — |  |  |  | 8,037 |
Collateralized mortgage obligations - residential |  |  | 2,986 |  |  |  | 4 |  |  |  | (13 | ) |  |  | 2,977 |
|  | $ | 59,884 |  |  | $ | 322 |  |  | $ | (13 | ) |  | $ | 60,193 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | September 30, 2020 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 32,576 |  |  | $ | 32,577 |
Due after one year through five years |  |  | 651 |  |  |  | 659 |
|  |  | 33,227 |  |  |  | 33,236 |
Mortgage-backed securities - residential |  |  | 6,124 |  |  |  | 6,429 |
Collateralized mortgage obligations - residential |  |  | 2,381 |  |  |  | 2,383 |
|  | $ | 41,732 |  |  | $ | 42,048 |
Realized Gain (Loss) on Investments [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Proceeds |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3,722 |
Gross gains |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 295 |
Gross losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  |  |  |  |  | Less than 12 Months |  |  |  |  |  |  | 12 Months or More |  |  |  |  |  |  | Total |
|  | Count |  |  | Fair Value |  |  | Unrealized Loss |  |  | Count |  |  | Fair Value |  |  | Unrealized Loss |  |  | Count |  |  | Fair Value |  |  | Unrealized Loss |
September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized mortgage obligations - residential |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 3 |  |  | $ | 1,695 |  |  | $ | (2 | ) |  |  | 3 |  |  | $ | 1,695 |  |  | $ | (2 | )
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized mortgage obligations - residential |  |  | 3 |  |  | $ | 1,566 |  |  | $ | (10 | ) |  |  | 1 |  |  | $ | 937 |  |  | $ | (3 | ) |  |  | 4 |  |  | $ | 2,503 |  |  | $ | (13 | )

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