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Note 15 - Employee Benefit Plans - Summary of Fair Values of Pension Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair value of plan assets | $ 32,353 | $ 31,738 | $ 30,199
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 15,658 | 12,750 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Fair value of plan assets | 2,744 | 2,228 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member] |  |  |
Fair value of plan assets | 2,272 | 1,935 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Mid Cap [Member] |  |  |
Fair value of plan assets | 867 | 1,067 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Small Cap [Member] |  |  |
Fair value of plan assets | 224 | 609 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |
Fair value of plan assets | 2,256 | 2,214 |
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] |  |  |
Fair value of plan assets | 391 | 546 |
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member] |  |  |
Fair value of plan assets | 600 | 757 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] |  |  |
Fair value of plan assets | 6,304 | 3,394 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets | 16,695 | 18,988 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Mid Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Small Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] |  |  |
Fair value of plan assets | $ 16,695 | $ 18,988 |

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