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Note 9 - Product Warranty Obligations (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022
Standard Product Warranty Accrual, Warranty Provision | $ 37,338 |
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
Name: | gnrc_ExtendedWarrantyTerm
Namespace Prefix: | gnrc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of warranty provision for standard product warranty accrual. + References No definition available. + Details
Name: | gnrc_StandardProductWarrantyAccrualWarrantyProvision
Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |