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Note 18 - Commitments and Contingencies (Details Textual) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2021 | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Amount Financed by Dealers |  | $ 115.9 | $ 55.6
Case No. 2:21-cv- 06777 and Case No. 2:21-cv- 07009 [Member] |  |  |
Loss Contingency, New Claims Filed, Number | 2 |  |

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- Definition Amount financed by dealers to purchase goods from the entity. + References No definition available. + Details
Name: | gnrc_AmountFinancedByDealers
Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_LitigationCaseAxis=gnrc_CaseNo221cv06777AndCaseNo221cv07009Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |