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Note 13 - Income Taxes (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Litigation Reserve Expense, Amount $ 38.2    
Deferred Tax Liabilities, Net, Total 179.3 $ 113.9  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0.2 $ 0.4 $ 0.5
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 0.7    
State and Local Jurisdiction [Member] | Pennsylvania Department of Revenue [Member]      
Income Tax Examination, Year under Examination   2019 2020 2021