Note 9 - Property, Plant and Equipment, Net of Accumulated Depreciation (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Costs Capitalized	$ 23	$ 35	$ 40
Precious Metals	3,000	3,000
Depletion	$ 20	$ 19	$ 21