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Note 12 - Stock Repurchase Program (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 38 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Oct. 01, 2018 | Aug. 31, 2015
Stock Repurchase Program, Authorized Amount | $ 250,000 |  |  |  |  | $ 200,000
Stock Repurchase Program, Period in Force | 2 years |  |  |  |  |
Payments for Repurchase of Common Stock |  | $ 25,656 | $ 30,012 | $ 305,547 |  |
Subsequent Event [Member] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 250,000 |
Treasury Stock [Member] |  |  |  |  |  |
Shares Acquired Under Stock Repurchases Program, Shares |  | 560,000 | 844,500 | 8,676,706 |  |

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- Definition Number of shares that have been repurchased during the period and are being held in treasury + References No definition available. + Details
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Namespace Prefix: | gnrc_
Data Type: | xbrli:sharesItemType
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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- Details
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