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Note 20 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Pramac [Member]	Feb. 15, 2016
Entity Number of Employees	600
Number Of Manufacturing Plants	4
Number Of Commercial Branches	14
Number of Countries in which Entity Operates	150

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

- Definition

Represents the number of commercial branches.

+ References

No definition available.

+ Details

Name:	gnrc_NumberOfCommercialBranches
Namespace Prefix:	gnrc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represent the number of manufacturing plants.

+ References

No definition available.

+ Details

Name:	gnrc_NumberOfManufacturingPlants
Namespace Prefix:	gnrc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=gnrc_PramacMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: