Note 18 - Income Taxes - Income From Continuing Operations Before Income Taxes and Equity in Income (Losses) of Investees (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S									$ 14,097	$ 13,680	$ (7,109)
Non-U.S. (foreign)									123,084	157,050	148,197
Total income from continuing operations, before income taxes and equity in losses	$ 48,293	$ 11,408	$ 31,376	$ 46,104	$ 40,025	$ 33,446	$ 45,039	$ 52,220	$ 137,181	$ 170,730	$ 141,088