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Note 18 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Oct. 05, 2023	May 03, 2023	Aug. 01, 2022	Jan. 26, 2026	Dec. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Oct. 28, 2022
Amount Financed by Dealers					$ 149,737	$ 165,432
Power Home Solar, LLC Against Generac Power Systems, Inc. [Member] | Minimum [Member]
Loss Contingency, Damages Sought, Value			$ 25,000
Daniel Haak Lawsuit [Member]
Loss Contingency Accrual									$ 15,000
Consumer Product Safety Commission [Member]
Settlement Agreement, Civil Fine Payments		$ 15,800
Case No. 22-cv-00072-JRG [Member]
Loss Contingency Accrual								$ 12,669
Litigation Settlement, Amount Awarded to Other Party	$ 11,500
Case No. 22-cv-00072-JRG [Member] | Estimated Prejudgment Interest [Member]
Loss Contingency Accrual							$ 1,826
Zawaski et al. v. General Power Systems, Inc., et al. [Member] | Other Accrued Liabilities [Member]
Loss Contingency Accrual					206,500
Zawaski et al. v. General Power Systems, Inc., et al. [Member] | Prepaid Expenses and Other Current Assets [Member]
Insurance Settlements Receivable					$ 102,000
Zawaski et al. v. General Power Systems, Inc., et al. [Member] | Subsequent Event [Member]
Accrual for Legal Settlements to be Paid in Cash				$ 104,500

X

- Definition

Represents the amount reserved for legal settlements to be paid in cash.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
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Period Type:	instant

X

- Definition

Amount financed by dealers to purchase goods from the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
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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 due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

+ 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

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

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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
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-Section 50
-Paragraph 9
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

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