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Note 8 - Employee Benefit Plans - Fair Value and Asset Allocations of Pension Benefits (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
Defined Benefit Plan, Actual Plan Asset Allocations |  | 100.00% | 100.00% |
Defined Benefit Plan, Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 12,047 | $ 11,534 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 50.00% | 55.00% |
Debt Security, Corporate, US [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | $ 4,605 | $ 3,919 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 19.00% | 19.00% |
Liability Driven Investment Funds [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 5,168 | $ 3,615 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 22.00% | 17.00% |
Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 1,860 | $ 1,514 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 8.00% | 7.00% |
Other Plan Assets [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 246 | $ 532 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 1.00% | 3.00% |
[1] | Updated dimension from: "Debt Securities [Member]".

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