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Note 15 - Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Unrealized Gains (Losses) On Securities |  |  | Changes in fair value of derivative contracts designated as hedge transactions |  |  | Adjustments For Pension Plans |  |  | Total Accumulated Other Comprehensive Loss, Net |
Balance January 1, 2018 |  | $ | 3,719 |  |  | $ | 5,030 |  |  | $ | (32,122 | ) |  | $ | (23,373 | )
Change in accounting |  |  | (1,289 | ) |  |  | — |  |  |  | — |  |  |  | (1,289 | )
2018 change |  |  | (2,443 | ) |  |  | (13,814 | ) |  |  | (1,550 | ) |  |  | (17,807 | )
Balance December 31, 2018 |  |  | (13 | ) |  |  | (8,784 | ) |  |  | (33,672 | ) |  |  | (42,469 | )
2019 change |  |  | — |  |  |  | 8,436 |  |  |  | (3,277 | ) |  |  | 5,159 |
Balance December 31, 2019 |  |  | (13 | ) |  |  | (348 | ) |  |  | (36,949 | ) |  |  | (37,310 | )
2020 change |  |  | — |  |  |  | 7,980 |  |  |  | (3,559 | ) |  |  | 4,421 |
Balance December 31, 2020 |  | $ | (13 | ) |  | $ | 7,632 |  |  | $ | (40,508 | ) |  | $ | (32,889 | )
|  | Income Tax Effect of: |
|  | Unrealized Gains (Losses) On Securities |  |  | Changes in fair value of derivative contracts designated as hedge transactions |  |  | Adjustments For Pension Plans |  |  | Total Accumulated Other Comprehensive Loss, Net |
Balance January 1, 2018 |  | $ | 1,791 |  |  | $ | — |  |  | $ | 10,120 |  |  | $ | 11,911 |
2018 change |  |  | (1,791 | ) |  |  | — |  |  |  | 2,455 |  |  |  | 664 |
Balance December 31, 2018 |  |  | — |  |  |  | — |  |  |  | 12,575 |  |  |  | 12,575 |
2019 change |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance December 31, 2019 |  |  | — |  |  |  | — |  |  |  | 12,575 |  |  |  | 12,575 |
2020 change |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance December 31, 2020 |  | $ | — |  |  | $ | — |  |  | $ | 12,575 |  |  | $ | 12,575 |

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