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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
(Dollars in thousands) |  | As of December 31, |
|  | 2020 |  |  | 2019 |
Unrealized gain (loss) on available for sale securities |  | $ | 13,959 |  |  | $ | 1,713 |
Unrecognized gains on post-retirement benefits |  |  | — |  |  |  | 158 |
Tax effect |  |  | (2,931 | ) |  |  | (393 | )
Accumulated other comprehensive income (loss) |  | $ | 11,028 |  |  | $ | 1,478 |

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