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Note 14 - Income Tax - Effective Income Tax Rate Reconciliation (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Combined statutory rate | 26.50% | 26.50%
Nondeductible expenses | 2.50% | 2.10%
Tax effect of flow through entities | (1.40%) | (1.10%)
Impact of changes in foreign exchange rates | 0.20% | 0.50%
Adjustments to tax liabilities for prior periods | 0.20% | 0.90%
Effect of changes in enacted US federal tax rate |  | 7.50%
Effect of changes in enacted tax rate in other jurisdictions | (0.70%) |
Changes in liability for unrecognized tax benefits | (0.30%) | (0.40%)
Stock-based compensation | 0.90% | 0.60%
Foreign, state, and provincial tax rate differential | (0.20%) | 2.60%
Change in valuation allowance | (0.10%) | (0.90%)
Contingent acquisition consideration | 1.20% | 1.00%
Other | 0.50% | 0.40%
Effective income tax rate | 29.30% | 39.70%

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 changes in the income tax rates in foreign jurisdictions. + References No definition available. + Details
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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 applicable to statutory income tax expense (benefit) outside of the country of domicile, state and provincial. + References No definition available. + Details
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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 valuation allowance for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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