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Note 18 - Income Tax - Earnings Before Income Tax by Jurisdiction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Before Income Tax by Jurisdiction	$ 190,598	$ 181,834
Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Earnings Before Income Tax by Jurisdiction	10,876	21,627
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Earnings Before Income Tax by Jurisdiction	49,884	40,097
Foreign Tax Authority [Member] | Other Foreign Tax Authorities [Member]
Earnings Before Income Tax by Jurisdiction	$ 129,838	$ 120,110

X

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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