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Note 11 - Product Warranty Obligations (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Standard Product Warranty Accrual, Warranty Provision | $ 37,338 |  |  |
Capitalized Contract Cost, Net |  | $ 17,140 | $ 10,153 |
Capitalized Contract Cost, Amortization |  | $ 2,958 | $ 2,306 | $ 1,932
Minimum [Member] |  |  |  |
Extended Warranty Term (Year) |  | 5 years |  |
Maximum [Member] |  |  |  |
Extended Warranty Term (Year) |  | 10 years |  |

X
- Definition Expiration period of the extended warranty. + References No definition available. + Details
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- Definition The amount of warranty provision for standard product warranty accrual. + References No definition available. + Details
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Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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X
- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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- Details
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- Details
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