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Note 6 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net sales	$ 417,421	$ 373,121	$ 367,376	$ 286,535	$ 357,830	$ 359,291	$ 288,360	$ 311,818	$ 1,444,453	$ 1,317,299	$ 1,460,919
Residential Power Products [Member]
Net sales									772,436	673,764	722,206
Commercial and Industrial Power Products [Member]
Net sales									557,532	548,440	652,216
Other Products and Services [Member]
Net sales									$ 114,485	$ 95,095	$ 86,497

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_ProductOrServiceAxis=gnrc_ResidentialPowerProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=gnrc_CommercialAndIndustrialPowerProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=gnrc_OtherProductsAndServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: