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Note 3 - Acquisitions (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Payments to Acquire Businesses, Net of Cash Acquired	$ 762	$ 34,740	$ 15,974
Wolverine, Ageto, C&I BESS, and Huntington [Member]
Payments to Acquire Businesses, Net of Cash Acquired	45,765
Acquisition of REFUstor [Member]
Payments to Acquire Businesses, Net of Cash Acquired	$ 16,127

X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=gnrc_WolverineAgetoCiBessAndHuntingtonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=gnrc_AcquisitionOfRefustorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: