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Note 4 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands	1 Months Ended		12 Months Ended
	May 31, 2014	Oct. 31, 2013	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk			$ 4,703	$ (1,295)
Commodity Contract [Member]
Derivative, Number of Instruments Held			1	1
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Cost of Sales [Member]
Derivative, Gain (Loss) on Derivative, Net			$ 377	$ 739	$ (1,909)
Commodity Contract [Member] | Maximum [Member]
Derivative, Remaining Maturity			1 year 180 days
Foreign Exchange Contract [Member]
Derivative, Number of Instruments Held			28	38
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other, Net [Member]
Derivative, Gain (Loss) on Derivative, Net			$ 697	$ (385)	(624)
Foreign Exchange Contract [Member] | Maximum [Member]
Derivative, Remaining Maturity			1 year
Interest Rate Swap [Member]
Number of New Contracts Entered	1	2	20
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net			$ 3,712	$ 535	$ (965)

X

- Definition

Represents the fair value of derivative contracts excluding impact of credit risk.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Number of new contracts entered into during the period mentioned.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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Balance Type:	credit
Period Type:	duration

X

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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Balance Type:	credit
Period Type:	duration

X

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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Balance Type:	na
Period Type:	instant

X

- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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