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Note 11 - Product Warranty Obligations - Recognition of Deferred Revenue Related to Extended Warranties (Details) $ in Thousands | Dec. 31, 2025 USD ($)
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Extended Warranties [Member] |
Revenue performance obligation | $ 219,404

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_ProductOrServiceAxis=gnrc_ExtendedWarrantiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |