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Note 12 - Income Taxes - Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
U.S. statutory federal tax rate 35.00% 34.00% 34.00%
Settlement with tax authorities 6.20%
Foreign income at lower rates (41.20%) (41.10%) (43.10%)
One-time deemed repatriation transition tax 50.50%
Remeasurement of deferred taxes 11.80%
Changes in valuation allowance (36.20%) 11.00% 17.60%
Stock-based compensation 2.20% 2.20%
Other adjustments (0.70%) 1.80% 2.50%
Effective tax rate 21.40% 7.90% 17.20%