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Note 16 - Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Employer Contribution under Medical and Dental Plan	$ 33,163	$ 32,964	$ 26,090
Savings Plan 401(k) [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan Percentage of Eligible Compensation	8.00%
Defined Contribution Plan, Cost	$ 9,316	$ 7,779	$ 3,735

X

- Definition

Percentage of eligible compensation of employees under defined contribution plan.

+ References

No definition available.

+ Details

Name:	gnrc_DefinedContributionPlanPercentageOfEligibleCompensation
Namespace Prefix:	gnrc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contribution made under medical and dental plan made by the employer.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=gnrc_SavingsPlan401kMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: