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Note 7 - Accrued Retirement Benefits - Fair Values of Pension Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Fair value of pension plan assets | $ 13,860 | $ 13,783 | $ 32,103
Equity Funds [Member] |  |  |
Fair value of pension plan assets | 760 | 1,459 |
Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 12,072 | 10,927 |
Money Market Funds [Member] |  |  |
Fair value of pension plan assets | 1,028 | 1,397 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of pension plan assets | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member] |  |  |
Fair value of pension plan assets | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Fair value of pension plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of pension plan assets | 13,790 | 12,694 |
Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member] |  |  |
Fair value of pension plan assets | 760 | 631 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 12,002 | 10,666 |
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |
Fair value of pension plan assets | 1,028 | 1,397 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of pension plan assets | 70 | 1,089 |
Fair Value, Inputs, Level 3 [Member] | Equity Funds [Member] |  |  |
Fair value of pension plan assets | 0 | 828 |
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 70 | 261 |
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |  |
Fair value of pension plan assets | $ 0 | $ 0 |

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