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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Payments to Acquire Businesses, Net of Cash Acquired	$ (0)	$ 21,784
Wolverine, Ageto, C&I BESS, and Huntington [Member]
Payments to Acquire Businesses, Net of Cash Acquired			$ 46,265

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

Name:	us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix:	us-gaap_
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: