Note 18 - Business Segments - Long Lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Long Lived Assets, Geographic Area	$ 3,042,227	$ 2,606,240	$ 2,379,537
UNITED STATES
Long Lived Assets, Geographic Area	2,527,429	2,084,021	1,870,335
KENYA
Long Lived Assets, Geographic Area	297,427	289,266	284,526
Other Foreign Countries [Member]
Long Lived Assets, Geographic Area	$ 217,371	$ 232,953	$ 224,676