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Note 3 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands		3 Months Ended		6 Months Ended
	Oct. 23, 2013	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Commodity Contract [Member] | Maximum [Member]
Derivative, Remaining Maturity		1 year 180 days
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Cost of Sales [Member]
Derivative, Gain (Loss) on Derivative, Net		$ 82	$ (315)	$ 76	$ (1,041)
Commodity Contract [Member]
Derivative, Number of Instruments Held		1	3	1	3	1
Foreign Exchange Contract [Member] | Maximum [Member]
Derivative, Remaining Maturity		1 year
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Cost of Sales [Member]
Derivative, Gain (Loss) on Derivative, Net		$ 1	$ (37)	$ (178)	$ (358)
Foreign Exchange Contract [Member]
Derivative, Number of Instruments Held		12	2	12	2	6
Interest Rate Swap [Member]
Number of New Contracts Entered	2
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		$ (134)	$ 266	$ (1,288)	$ (1,006)
Commodity and Foreign Currency Contracts [Member]
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk		(4,672)		(4,672)		$ (3,248)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		$ 83	$ (352)	$ (102)	$ (1,399)

X

- Definition

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

+ References

No definition available.

+ Details

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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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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=64837297&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=64837297&loc=SL5624171-113959

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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=64837297&loc=SL5624171-113959

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X

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ 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 (e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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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=64837297&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=64837297&loc=SL5579245-113959

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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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