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Note 12 - Subsequent Events (Details) (Subsequent Event [Member], MAC, Inc. [Member]) | Oct. 01, 2014
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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