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v3.21.1

Note 9 - Product Warranty Obligations (Details Textual) | 3 Months Ended
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Mar. 31, 2021
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
- 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: |