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Note 9 - Product Warranty Obligations (Details Textual)	3 Months Ended
	Mar. 31, 2024
Minimum [Member]
Extended Warranty Term (Year)	5 years
Maximum [Member]
Extended Warranty Term (Year)	10 years

X

- Definition

Expiration period of the extended warranty.

+ References

No definition available.

+ Details

Name:	gnrc_ExtendedWarrantyTerm
Namespace Prefix:	gnrc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: