Note 3 - Acquisitions - Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Redemption value adjustment	$ (17,970)		$ 909	$ (909)
Redeemable Noncontrolling Interest [Member]
Balance at beginning of period	43,929		33,138
Noncontrolling interest of Pramac		[1]	1,540	34,253
Net income	2,214		1,631	100
Foreign currency translation	(3,109)		8,529	(2,124)
Redemption value adjustment	17,970		(909)	909
Balance at end of period	$ 61,004		$ 43,929	$ 33,138

[1] Represents the additional noncontrolling interest of Pramac resulting from a common control transaction between the Generac Mobile Products S.r.l. and Pramac UK Limited legal entities.