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Note 14 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net income attributable to Generac Holdings Inc. |  | $ 69,614 | $ 75,574 | $ 61,958 | $ 44,861 | $ 75,575 | $ 75,776 | $ 53,261 | $ 33,645 | $ 252,007 | $ 238,257 | $ 157,808
Redeemable noncontrolling interest redemption value adjustment |  |  |  |  |  |  |  |  |  | 1,253 | (17,970) | 909
Net income attributable to common shareholders |  |  |  |  |  |  |  |  |  | $ 253,260 | $ 220,287 | $ 158,717
Weighted average shares, basic (in shares) |  |  |  |  |  |  |  |  |  | 61,926,986 | 61,662,031 | 62,040,704
Dilutive effect of stock compensation awards (in shares) | [1] |  |  |  |  |  |  |  |  | 938,460 | 571,194 | 602,168
Diluted shares (in shares) |  |  |  |  |  |  |  |  |  | 62,865,446 | 62,233,225 | 62,642,872
Basic (in dollars per share) |  | $ 1.14 | $ 1.20 | $ 0.99 | $ 0.77 | $ 1.21 | $ 1.12 | $ 0.83 | $ 0.42 | $ 4.09 | $ 3.57 | $ 2.56
Diluted (in dollars per share) |  | $ 1.12 | $ 1.18 | $ 0.98 | $ 0.76 | $ 1.20 | $ 1.11 | $ 0.82 | $ 0.42 | $ 4.03 | $ 3.54 | $ 2.53
[1] | Excludes approximately 38,900 and 48,200 stock options for the three and nine months ended September 30, 2018, respectively, as the impact of such awards was anti-dilutive. There were no awards with an anti-dilutive impact for the three and nine months ended September 30, 2019.

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