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Note 8 - Employee Benefit Plans - Fair Value of Plan Assets By Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan, Fair Value of Plan Assets | $ 23,926 | $ 21,114 | $ 17,819
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1,860 | 1,514 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 22,066 | 19,600 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 0 | $ 0 |

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