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Note 13 - Retirement Benefit Plans - Weighted-average Asset Allocations by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Asset |  | $ 0 |  |
Pension Plan [Member] |  |  |  |
Asset |  |  | $ 15,000 |
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Asset |  |  | 2,800 |
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Asset |  |  | 0 |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Asset |  |  | 12,200 |
Pension Plan [Member] | Foreign Plan [Member] |  |  |  |
Asset |  | 13,300 | 12,200 | $ 10,800
Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Asset |  | 0 |  |
Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Asset |  | 0 |  |
Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Asset |  | 13,300 |  |
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] |  |  |  |
Asset | [1] |  | 12,200 |
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Asset | [1] |  | 0 |
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Asset | [1] |  | 0 |
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Asset | [1] |  | 12,200 |
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Foreign Plan [Member] |  |  |  |
Asset | [1] | 13,300 |  |
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Asset | [1] | 0 |  |
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Asset | [1] | 0 |  |
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Asset | [1] | $ 13,300 |  |
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |  |  |
Asset |  |  | 2,800 |
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Asset |  |  | 2,800 |
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Asset |  |  | 0 |
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Asset |  |  | $ 0 |
[1] | This category is comprised of investments in insurance contracts.

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