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Note 12 - Commitments and Contingencies (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Amount Financed by Dealers	$ 33,700	$ 26,100

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

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration