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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	Apr. 26, 2019	Mar. 12, 2019	Sep. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total				$ (0)	$ 112,941
Goodwill, Ending Balance				$ 796,169		$ 805,284
Pika [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 49,068
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill	58,196
Goodwill, Ending Balance	$ 19,896
Neurio [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 59,071	$ 7,922
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill		58,762
Goodwill, Ending Balance		$ 17,862

X

- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset including goodwill.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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Period Type:	instant

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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