Note 20 - Business Segments - Revenues as Reported in the Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues	$ 662,591	$ 594,644	$ 559,524
UNITED STATES
Revenues	307,025	286,509	293,710
INDONESIA
Revenues	100,856	93,191	38,174
KENYA
Revenues	109,270	86,545	86,074
TURKEY
Revenues	46,270	57,356	86,340
CHILE
Revenues	58,032	34,478
GUATEMALA
Revenues	30,086	27,897	28,439
Other Foreign Countries [Member]
Revenues	$ 11,052	$ 8,668	$ 26,787