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Note 11 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income attributable to Generac Holdings Inc.		$ 39,709	$ 26,183	$ 78,211	$ 57,279
Redeemable noncontrolling interest redemption value adjustment				909
Net income attributable to common shareholders		$ 39,709	$ 26,183	$ 79,120	$ 57,279
Weighted average shares, basic (in shares)		61,758,190	64,615,935	62,094,807	65,506,469
Dilutive effect of stock compensation awards (in shares)	[1]	558,598	510,182	608,462	485,658
Diluted shares (in shares)		62,316,788	65,126,117	62,703,269	65,992,127
Basic (in dollars per share)		$ 0.64	$ 0.41	$ 1.27	$ 0.87
Diluted (in dollars per share)		$ 0.64	$ 0.40	$ 1.26	$ 0.87
[1] Excludes approximately 146,000 stock options for the three-month period ended September 30, 2017, and 188,800 stock options for the nine-month period ended September 30, 2017, as the impact of such awards was anti-dilutive. Excludes approximately 208,400 stock options for the three-month period ended September 30, 2016, and 172,900 stock options for the nine-month period ended September 30, 2016, as the impact of such awards was anti-dilutive.

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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