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Note 3 - Redeemable Noncontrolling Interest (Details Textual) - USD ($) $ in Thousands		1 Months Ended
	Feb. 01, 2019	Mar. 31, 2022	May 31, 2021	Feb. 28, 2019	Mar. 01, 2016
Pramac [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			20.00%		35.00%
Captiva Energy Solutions [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	49.00%	34.00%
Pramac [Member]
Business Acquisition, Percentage of Voting Interests Acquired			15.00%		65.00%
Redeemable Noncontrolling Interest, Equity, Fair Value, Total					$ 34,253
Noncontrolling Interest Agreement, Extension of Term (Year)			3 years	5 years
Payments for Repurchase of Redeemable Noncontrolling Interest			$ 27,164
Business Combination, Step Acquisition, Equity Interest in Acquiree, including Subsequent Acquisition, Percentage, Total			80.00%
Captiva Energy Solutions [Member]
Business Acquisition, Percentage of Voting Interests Acquired	51.00%	15.00%
Redeemable Noncontrolling Interest, Equity, Fair Value, Total	$ 3,165
Payments for Repurchase of Redeemable Noncontrolling Interest		$ 461
Business Combination, Step Acquisition, Equity Interest in Acquiree, including Subsequent Acquisition, Percentage, Total		66.00%
Business Acquisition, Noncontrolling Interest, Term of Put Option (Year)	5 years
Business Acquisition, Term of Call Option (Year)	5 years

X

- Definition

The term of a put option available to the noncontrolling interest of a business acquired by the reporting entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The term of call option available to the company in a business acquisition transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The extension of the term in the noncontrolling interest agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
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X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

The cash outflow during the period for redemption of redeemable noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

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Period Type:	duration

X

- Definition

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 14
-URI https://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (16)(c)
-URI https://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (12)(c)
-URI https://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 15
-URI https://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764

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- Details

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X

- Details

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X

- Details

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X

- Details

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