Note 14 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Net income attributable to Generac Holdings Inc.		$ 44,460	$ 44,861
Redeemable noncontrolling interest redemption value adjustment		(1,522)	2,432
Net income attributable to common shareholders		$ 42,938	$ 47,293
Weighted average shares, basic (in shares)		62,126,481	61,762,260
Dilutive effect of stock compensation awards (in shares)	[1]	1,157,256	461,378
Diluted shares (in shares)		63,283,737	62,223,638
Basic (in dollars per share)		$ 0.69	$ 0.77
Diluted (in dollars per share)		$ 0.68	$ 0.76

[1] Excludes approximately 71,800 stock options for the three months ended March 31, 2019, as the impact of such awards was anti-dilutive. There were no awards with an anti-dilutive impact for the three months ended March 31, 2020.