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Note 12 - Subsequent Events (Details) (Subsequent Event [Member], MAC, Inc. [Member])	Oct. 01, 2014
Subsequent Event [Member] | MAC, Inc. [Member]
Note 12 - Subsequent Events (Details) [Line Items]
Entity Number of Employees	100

X

- Definition

Number of persons employed by the Entity

+ References

No definition available.

+ Details

Name:	dei_EntityNumberOfEmployees
Namespace Prefix:	dei_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	gnrc_Note12SubsequentEventsDetailsLineItems
Namespace Prefix:	gnrc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration