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Note 2 - Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Property Plant and Equipment, Estimated Useful Lives [Table Text Block]

Land improvements	8	–	20
Buildings and improvements	10	–	40
Machinery and equipment	3	–	15
Dies and tools	3	–	10
Vehicles	3	–	6
Office equipment and systems	3	–	15
Leasehold improvements	2	–	20

X

- Definition

Tabular disclosure for the useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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