Note 12 - Business Segments, Sales of Products and Significant Customers - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Long-lived assets	[1]	$ 2,520,004	$ 1,999,311
UNITED STATES
Long-lived assets		1,797,441	1,248,824
CANADA
Long-lived assets		707,473	743,779
MEXICO
Long-lived assets		$ 15,090	$ 6,708

[1] Amounts reported as of and for the years ended December 31, 2017 and 2016 have been revised. See Note 2 for more information.