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Note 16 - Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 16 - Commitments and Contingencies (Details) [Line Items]
Operating Leases, Rent Expense, Net	$ 4,102us-gaap_OperatingLeasesRentExpenseNet	$ 2,457us-gaap_OperatingLeasesRentExpenseNet	$ 2,870us-gaap_OperatingLeasesRentExpenseNet
Amount Financed by Dealers	$ 26,100gnrc_AmountFinancedByDealers	$ 24,300gnrc_AmountFinancedByDealers
Minimum [Member]
Note 16 - Commitments and Contingencies (Details) [Line Items]
Lease Term	3 years
Maximum [Member]
Note 16 - Commitments and Contingencies (Details) [Line Items]
Lease Term	5 years

X

- Definition

Amount financed by dealers to purchase goods from the entity.

+ References

No definition available.

+ Details

Name:	gnrc_AmountFinancedByDealers
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents lease term of certain computer equipment, automobiles, and warehouse space under operating leases.

+ References

No definition available.

+ Details

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

X

- Details

Name:	gnrc_Note16CommitmentsandContingenciesDetailsLineItems
Namespace Prefix:	gnrc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: