Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Unrecognized Tax Benefits, Ending Balance	$ 26.9		$ 28.5
Liability for Uncertainty in Income Taxes, Current			2.4
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	0.4	$ 0.4
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 4.6		$ 5.2
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Open Tax Year	2017 2018 2019 2020
State and Local Jurisdiction [Member]
Open Tax Year	2014 2015 2016 2017 2018 2019 2020
Foreign Tax Authority [Member] \| Asia [Member]
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Foreign Tax Authority [Member] \| Europe [Member]
Open Tax Year	2012 2013 2014 2015 2016 2017 2018 2019 2020

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.

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Amount recognized for uncertainty in income taxes classified as current.

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Tax year that remains open to examination under enacted tax laws, in YYYY format.

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