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Note 12 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net income attributable to Generac Holdings Inc.		$ 33,645	$ 12,175
Redeemable noncontrolling interest redemption value adjustment		(7,665)	614
Net income attributable to common shareholders		$ 25,980	$ 12,789
Weighted average shares, basic (in shares)		61,943,495	62,366,263
Dilutive effect of stock compensation awards (in shares)	[1]	531,441	569,863
Diluted shares (in shares)		62,474,936	62,936,126
Basic (in dollars per share)		$ 0.42	$ 0.21
Diluted (in dollars per share)		$ 0.42	$ 0.20
[1] Excludes approximately 93,600 and 154,900 stock options for the three months ended March 31, 2018 and March 31, 2017, respectively, as the impact of such awards was anti-dilutive.

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