Note 7 - Interest Expense, Net - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest related to sale of tax benefits	$ 1,761	$ 1,849	$ 3,170	$ 3,861
Interest expense	15,421	14,146	28,727	28,321
Less — amount capitalized	(1,336)	(1,455)	(1,707)	(2,719)
Interest Expense, Total	$ 15,846	$ 14,540	$ 30,190	$ 29,463