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Note 18 - Income Taxes - Difference Between US Federal Statutory Tax Rate and Company's Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. federal statutory tax rate	35.00%	35.00%	35.00%
Impact of federal tax reform	(12.40%)
Transition tax inclusion	42.10%
Foreign tax credits	(50.50%)
Tax basis adjustment		(4.90%)	34.90%
Withholding tax	34.10%
State income tax, net of federal benefit	1.10%	(0.60%)	0.60%
Effect of foreign income tax, net	(10.70%)	(10.30%)	(5.90%)
Production tax credits	(1.20%)	(8.30%)	(0.10%)
Subpart F income	1.70%	0.30%	1.30%
Other, net	(3.90%)	(1.40%)
Effective tax rate	12.70%	26.30%	(14.10%)
Domestic Tax Authority [Member]
Valuation allowance	(22.60%)	16.50%	(36.10%)
Foreign Tax Authority [Member]
Valuation allowance			(43.80%)

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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 income exempt from income tax because of a tax basis adjustment.

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