XML 56 R43.htm IDEA: XBRL DOCUMENT v3.20.4
Note 6 - Accrued Retirement Benefits (Details Textual) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
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