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Note 6 - Accrued Retirement Benefits - Fair Values of Pension Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Fair value of pension plan assets | $ 44,284 | $ 41,290 | $ 48,442
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of pension plan assets |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of pension plan assets | 44,284 | 41,290 |
Equity Funds [Member] |  |  |
Fair value of pension plan assets | 12,714 | 10,665 |
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of pension plan assets |  |  |
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of pension plan assets | 12,714 | 10,665 |
Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 30,548 | 29,635 |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of pension plan assets |  |  |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of pension plan assets | 30,548 | 29,635 |
Money Market Funds [Member] |  |  |
Fair value of pension plan assets | 1,022 | 990 |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of pension plan assets |  |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of pension plan assets | $ 1,022 | $ 990 |

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