Note 19 - Business Segments - Long Lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long Lived Assets, Geographic Area	$ 2,379,537	$ 2,221,267	$ 2,133,289
UNITED STATES
Long Lived Assets, Geographic Area	1,870,335	1,696,439	1,510,986
KENYA
Long Lived Assets, Geographic Area	284,526	301,956	340,970
Other Foreign Countries [Member]
Long Lived Assets, Geographic Area	$ 224,676	$ 222,872	$ 281,333