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Note 17 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax at statutory rate	21.00%	21.00%	21.00%
State and local taxes, net of federal benefit	3.50%	1.90%	1.40%
Effect of foreign operations	(3.70%)	3.50%	(4.30%)
Transaction costs	0.00%	0.10%	(4.20%)
Effect of 2017 deferred rate change	0.00%	0.00%	(1.00%)
Transition Tax	0	0	(0.010)
Effect of changes in valuation allowances	0.50%	(9.70%)	6.60%
Domestic production activities deduction	0.00%	(0.30%)	(0.40%)
Domestic production activities deduction	(0.00%)	0.30%	0.40%
Executive compensation over $1 million	2.10%	2.50%	1.00%
Share-based payments	(0.90%)	(2.00%)	(5.70%)
Research & Development credit	(3.30%)	(1.90%)	(3.60%)
Other, net	(1.30%)	0.00%	(4.20%)
Effective income tax rate	17.90%	15.10%	6.40%

X

- Definition

Percentage 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 executive compensation over one million.

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Percentage 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 transaction costs.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage 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 deduction for qualified production activity.

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Percentage 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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage 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 research and development expense.

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Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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