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Note 16 - Income Tax - Effective Income Tax Rate Reconciliation (Details)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Combined statutory rate 26.50% 26.50% 26.50%
Nondeductible expenses 2.40% 5.80% 6.40%
Tax effect of flow-through entities (1.10%) (2.50%) (2.90%)
Impact of changes in foreign exchange rates (2.10%) (0.80%)
Adjustments to tax liabilities for prior periods (0.40%) (1.40%) (2.50%)
Effects of changes in enacted tax rates (0.50%) 0.10%
Changes in liability for unrecognized tax benefits (0.60%) (0.60%) (1.90%)
Stock-based compensation 0.50% 13.90% 4.10%
Foreign, state, and provincial tax rate differential 4.40% 1.10% (6.20%)
Other taxes 1.40% 2.40% 2.40%
Change in valuation allowance 0.30% 0.60% (1.70%)
Outside basis difference in investments 0.50% 1.40% 1.40%
Other 0.40% 0.30% 0.30%
Effective income tax rate 34.30% 44.90% 25.20%