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Note 16 - Benefit Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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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
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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: |