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Note 16 - Benefit Plans - Fair Value of Pension Plan's Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Fair values of the Pension Plan's assets | $ 0 | $ 61,870 | $ 58,014
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair values of the Pension Plan's assets |  | 51,736 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair values of the Pension Plan's assets |  | 10,134 |
Mutual Fund [Member] |  |  |
Fair values of the Pension Plan's assets |  | 51,736 |
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair values of the Pension Plan's assets |  | 51,736 |
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair values of the Pension Plan's assets |  | 0 |
Other Investment [Member] |  |  |
Fair values of the Pension Plan's assets |  | 10,134 |
Other Investment [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair values of the Pension Plan's assets |  | 0 |
Other Investment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair values of the Pension Plan's assets |  | $ 10,134 | $ 9,700

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