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Note 6 - Accrued Retirement Benefits - Fair Values of Pension Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair value of pension plan assets | $ 43,587 | $ 44,284 | $ 41,290
Equity Funds [Member] |  |  |
Fair value of pension plan assets | 10,558 | 12,714 |
Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 32,066 | 30,548 |
Money Market Funds [Member] |  |  |
Fair value of pension plan assets | 963 | 1,022 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of pension plan assets |  |  |
Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member] |  |  |
Fair value of pension plan assets |  |  |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets |  |  |
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Fair value of pension plan assets |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of pension plan assets | 40,327 | 44,284 |
Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member] |  |  |
Fair value of pension plan assets | 9,406 | 12,714 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 29,958 | 30,548 |
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |
Fair value of pension plan assets | 963 | $ 1,022 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of pension plan assets | 3,260 |  |
Fair Value, Inputs, Level 3 [Member] | Equity Funds [Member] |  |  |
Fair value of pension plan assets | 1,152 |  |
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 2,108 |  |
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |  |
Fair value of pension plan assets |  |  |

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