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Note 16 - Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Employer Contribution under Medical and Dental Plan | $ 26,090,000 | $ 31,180,000 | $ 24,189,000
Savings Plan 401(k) [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
Defined Contribution Plan Percentage of Eligible Compensation | 6.00% |  |
Defined Contribution Plan, Cost | $ 3,735 | $ 4,141,000 | $ 6,725,000

X
- Definition Percentage of eligible compensation of employees under defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | gnrc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Contribution made under medical and dental plan made by the employer. + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |