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Note 18 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Dec. 27, 2023	Oct. 15, 2023	Jun. 23, 2023	May 03, 2023	Aug. 01, 2022	Dec. 31, 2023	Dec. 31, 2022
Amount Financed by Dealers						$ 158.0	$ 212.0
Consumer Product Safety Commission [Member]
Settlement Agreement, Civil Fine Payments				$ 15.8
Power Home Solar, LLC Against Generac Power Systems, Inc. [Member] | Minimum [Member]
Loss Contingency, Damages Sought, Value					$ 25.0
Case Nos. 21-cv-00428-ADA and 20-cv-00078-ADA [Member]
Litigation Settlement, Amount Awarded to Other Party	$ 4.6		$ 5.4
Case No. 22-cv-00072-JRG [Member]
Litigation Settlement, Amount Awarded to Other Party		$ 11.5

X

- Definition

Amount financed by dealers to purchase goods from the entity.

+ References

No definition available.

+ Details

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

X

- Definition

Represents civil fine payments for settlement payment.

+ References

No definition available.

+ Details

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X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-9

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