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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S									$ 14,187	$ 14,097	$ 13,680
Non-U.S. (foreign)									123,116	123,084	157,050
Income from operations before income tax and equity in earnings (losses) of investees	$ 41,085	$ 23,630	$ 31,466	$ 41,122	$ 48,293	$ 11,408	$ 31,376	$ 46,104	$ 137,303	$ 137,181	$ 170,730