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Note 13 - Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Liabilities, Net, Total	$ 463.9	$ 387.8
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3.4	8.1	$ 8.6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	0.5	$ 3.9	$ 4.6
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 0.6
Open Tax Year	2017 2018 2019 2020 2021
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member]
Income Tax Examination, Year under Examination	2013 2014 2015 2016 2017 2018
State and Local Jurisdiction [Member] | Pennsylvania Department of Revenue [Member]
Income Tax Examination, Year under Examination	2018 2019 2020

X

- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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