Note 17 - Interest Expense, Net - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest related to sale of tax benefits									$ 6,985	$ 9,349	$ 9,620
Interest expense									54,381	61,327	67,032
Less — amount capitalized									(7,224)	(3,287)	(4,075)
Interest Expense, Total	$ 12,987	$ 11,692	$ 14,540	$ 14,923	$ 15,828	$ 17,137	$ 18,401	$ 16,023	$ 54,142	$ 67,389	$ 72,577