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Note 18 - Commitments and Contingencies (Details Textual) $ in Millions	1 Months Ended
	Aug. 31, 2021	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Amount Financed by Dealers		$ 115.9	$ 55.6
Case No. 2:21-cv- 06777 and Case No. 2:21-cv- 07009 [Member]
Loss Contingency, New Claims Filed, Number	2

X

- Definition

Amount financed by dealers to purchase goods from the entity.

+ References

No definition available.

+ Details

Name:	gnrc_AmountFinancedByDealers
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

+ Details

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_LitigationCaseAxis=gnrc_CaseNo221cv06777AndCaseNo221cv07009Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: