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Note 13 - Stock Repurchase Program (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 50 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Oct. 31, 2016 | Aug. 31, 2015
Stock Repurchase Program, Authorized Amount |  |  | $ 250,000 |  | $ 250,000 | $ 200,000
Payments for Repurchase of Common Stock |  | $ (0) | $ 25,656 | $ 305,547 |  |
Treasury Stock [Member] |  |  |  |  |  |
Shares Acquired Under Stock Repurchases Program, Shares | 0 | 0 | 560,000 | 8,676,706 |  |

X
- 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
Balance Type: | na
Period Type: | duration

X
- 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=118932676&loc=d3e3291-108585 + Details
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X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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