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Note 15 - Income Tax - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income tax expense using combined statutory rate of 26.5% (2022 - 26.5%)	$ 53,884	$ 51,405
Permanent differences	2,075	584
Adjustments to tax liabilities for prior periods	111	230
Non-deductible stock-based compensation	5,667	4,782
Foreign, state and provincial tax rate differential	(5,420)	(8,043)
Other taxes	0	16
Total	$ 56,317	$ 48,974

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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 foreign income tax expense (benefit).

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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 nondeductible expenses.

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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 revisions of previously reported income tax expense (benefit).

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