Note 13 - Hedging Activities (Details Textual) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Billions	Jun. 30, 2016	Dec. 31, 2015
Gross Notional Value, Translated Earnings Contracts [Member]
Derivative, Notional Amount	$ 19.1	$ 12.0
Gross Notional Value, Collar Options [Member]
Derivative, Notional Amount	3.7	5.6
Gross Notional Value, Foreign Exchange Forward [Member]
Derivative, Notional Amount	15.4	6.4
Net Notional Value, Collar Options [Member]
Derivative, Notional Amount	$ 1.9	$ 2.9