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Note 3 - Redeemable Noncontrolling Interests (Details Textual) - USD ($) $ in Thousands			1 Months Ended	9 Months Ended
	Apr. 05, 2024	Feb. 01, 2019	May 31, 2022	Sep. 30, 2025	Sep. 30, 2024	Aug. 07, 2025
Payments for Repurchase of Redeemable Noncontrolling Interest				$ (0)	$ 9,117
Generac Juffali Generators WLL [Member]
Joint Venture Formation, Funded by Non-controlling Interest, Percent				49.00%
Captiva Energy Solutions [Member]
Business Combination, Voting Equity Interest Acquired, Percentage	34.00%	51.00%	15.00%
Redeemable Noncontrolling Interest, Equity, Fair Value		$ 3,165
Business Acquisition, Noncontrolling Interest, Term of Put Option (Year)		5 years
Payments for Repurchase of Redeemable Noncontrolling Interest	$ 9,117		$ 375
Business Combination, Achieved in Stages, Preacquisition and Acquired Equity Interests in Acquiree, Percentage			66.00%
Generac Juffali Generators WLL [Member]
Subsidiary, Ownership Percentage, Parent						51.00%
E.A. Juffali and Brothers [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner						49.00%
Joint Venture Formation, Fair Value of Joint Venture						$ 979
Captiva Energy Solutions [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner		49.00%

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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X

- Definition

The percent value of the amount of the joint venture funded by the other party.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of voting equity interest acquired in business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-8

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 38
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479303/805-10-55-38

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479405/805-10-25-9

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X

- Definition

Fair value of joint venture at its formation date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476180/805-60-50-2

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Balance Type:	credit
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 parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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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
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

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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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3A
-Subparagraph (24)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

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- Details

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X

- Details

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- Details

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- Details

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