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v3.3.1.900

Note 20 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Pramac [Member] | Feb. 15, 2016
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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: |