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

X

- 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

X

- Details

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