Note 4 - Redeemable Noncontrolling Interest - Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017
Redemption value adjustment	$ (6,912)				$ (16,882)		$ 909
Redeemable Noncontrolling Interest [Member]
Balance at beginning of period	53,035		37,796		43,929		33,138
Noncontrolling interest of Pramac			1,540	[1]			1,540	[1]
Net income	519		283		1,341		493
Foreign currency translation	(569)		2,178		(2,255)		7,535
Redemption value adjustment	6,912	[2]			16,882	[2]	(909)
Balance at end of period	$ 59,897		$ 41,797		$ 59,897		$ 41,797

[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.

[2] The redemption value adjustments recorded during the three and nine month periods ended September 30, 2018 relate to the adjustment required to reflect the redeemable noncontrolling interest value as a multiple of earnings after two years from the date of acquisition, in accordance with the terms of the acquisition.