Note 14 - Carrying Amount of Senior Notes (Details) (Parentheticals)	Jun. 30, 2016	Dec. 31, 2015
Senior Notes 5.625 Due 2020 [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.625%	5.625%
Senior Notes 5.5 Due 2024 [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.50%	5.50%
Senior Notes 6.00 Due January 2043 [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%