Note 20 - Business Segments - Long Lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Long Lived Assets, Geographic Area	$ 1,941,239	$ 1,857,129	$ 1,790,071
UNITED STATES
Long Lived Assets, Geographic Area	1,414,523	1,374,465	1,369,136
KENYA
Long Lived Assets, Geographic Area	327,157	375,257	330,200
Other Foreign Countries [Member]
Long Lived Assets, Geographic Area	$ 199,559	$ 107,407	$ 90,735