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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Payments to Acquire Businesses, Net of Cash Acquired | $ (0) | $ 17,812 |
Wolverine, Ageto, C&I BESS, and Huntington [Member] |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 46,265

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=gnrc_WolverineAgetoCiBessAndHuntingtonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |