Note 4 - Business Segments, Sales of Products and Significant Customers - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Long-lived assets		$ 2,310,810	[1]	$ 2,378,074	[1]	$ 2,447,450
UNITED STATES
Long-lived assets		1,662,689		1,701,307
CANADA
Long-lived assets	[1]	640,367		668,643
MEXICO
Long-lived assets		$ 7,754		$ 8,124

[1] Amounts reported as of and for the years ended December 31, 2020 and 2019 have been revised. See Note 3 for more information.