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Note 11 - Product Warranty Obligations (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Standard Product Warranty Accrual, Warranty Provision	$ 37,338
Capitalized Contract Cost, Net		$ 17,140	$ 10,153
Capitalized Contract Cost, Amortization		$ 2,958	$ 2,306	$ 1,932
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

- Definition

The amount of warranty provision for standard product warranty accrual.

+ References

No definition available.

+ Details

Name:	gnrc_StandardProductWarrantyAccrualWarrantyProvision
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479483/340-40-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479483/340-40-50-3

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Details

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Period Type:

X

- Details

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