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Note 17 - Changes in the Company's Benefit Obligation and Funded Status (Details) - Other Postretirement Benefit Plans [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Changes in the Company's Benefit Obligation and Funded Status [Line Items]    
Projected benefit obligation at beginning of period $ 86 $ 95
Interest cost 3 4
Plan participants’ contributions 7 9
Actuarial (gain) loss (8) 2
Benefit payments (12) (18)
Currency adjustments 2 (6)
Projected benefit obligation at end of period 78 86
Underfunded status at end of period $ (78) $ (86)