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Note 18 - Income Tax - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Combined statutory rate	26.50%	26.50%
Nondeductible expenses	3.00%	2.50%
Tax effect of flow through entities	(2.00%)	(1.40%)
Impact of changes in foreign exchange rates	(0.10%)	0.20%
Adjustments to tax liabilities for prior periods	(0.10%)	0.20%
Effect of changes in enacted tax rate in other jurisdictions	0.30%	(0.70%)
Changes in liability for unrecognized tax benefits		(0.30%)
Stock-based compensation	0.30%	0.90%
Foreign, state, and provincial tax rate differential	(1.50%)	(0.20%)
Change in valuation allowance	(0.40%)	(0.10%)
Contingent acquisition consideration	1.40%	1.20%
Other	0.40%	0.50%
Effective income tax rate	27.80%	29.30%

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- 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 changes in the income tax rates in foreign jurisdictions.

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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 contingent acquisition consideration.

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

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