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Note 6 - Accrued Retirement Benefits (Details Textual) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax | $ 21.7 | $ 20.8
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year | 0.9 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 0.6 |

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