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Note 5 - Fair Value Measurements - Reconciliation of Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Changes in fair value	$ 6,446	$ (281)
Contingent Consideration Liability [Member]
Beginning balance, January 1, 2022	146,759
Changes in fair value	(6,753)
Present value interest accretion	682
Currency translation	(1,225)
Ending balance, March 31, 2022	$ 139,463

X

- Definition

The gain (loss) due to currency translation of contingent consideration arrangements in business combination.

+ References

No definition available.

+ Details

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X

- Definition

The amount of increase due to present value interest accretion in contingent consideration arrangements from business combinations.

+ References

No definition available.

+ Details

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X

- Definition

Amount of gain (loss) from change in fair value of contingent consideration from business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
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X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126966325&loc=d3e6819-128478

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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