Note 3 - Redeemable Noncontrolling Interest - Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Redemption value adjustment	$ 2,432	$ (7,665)
Redeemable Noncontrolling Interest [Member]
Balance at beginning of period	61,004	43,929
Net income	265	(26)
Foreign currency translation	(1,480)	2,836
Redemption value adjustment	(2,432)	7,665
Balance at end of period	$ 57,357	$ 54,404