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Note 15 - Income Tax - Effective Income Tax Rate Reconciliation (Details)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Combined statutory rate 35.00% 26.50% 26.50%
Nondeductible expenses   2.10% 2.40%
Tax effect of flow through entities   (1.10%) (1.10%)
Impact of changes in foreign exchange rates   0.50%
Adjustments to tax liabilities for prior periods   0.90% (0.40%)
Effects of changes in enacted US federal tax rate   8.60%
Changes in liability for unrecognized tax benefits   (0.40%) (0.60%)
Stock-based compensation   0.60% 0.50%
Foreign, state, and provincial tax rate differential   2.50% 4.40%
Other taxes   0.70% 1.40%
Change in valuation allowance   (0.90%) 0.30%
Outside basis difference in investments   1.00% 0.50%
Other   (0.30%) 0.40%
Effective income tax rate   40.70% 34.30%