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Note 9 - Product Warranty Obligations - Recognition of Deferred Revenue Related to Extended Warranties (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Remainder of 2018	$ 9,196
2019	12,041
2020	10,666
2021	8,703
2022	6,811
After 2022	12,696
Total	$ 60,113	$ 57,854	$ 37,562	$ 36,139

X

- Definition

Amount of deferred revenue related to extended product warranty to be recognized after the fifth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	gnrc_ExtendedProductWarrantyAccrualDueAfterYearFive
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of deferred revenue related to extended product warranty to be recognized in the remainder of the fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	gnrc_ExtendedProductWarrantyAccrualDueInRemainderOfFiscalYear
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of deferred revenue related to extended product warranty to be recognized in the fifth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	gnrc_ExtendedProductWarrantyAccrualDueInYearFive
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of deferred revenue related to extended product warranty to be recognized in the fourth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	gnrc_ExtendedProductWarrantyAccrualDueInYearFour
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of deferred revenue related to extended product warranty to be recognized in the third fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	gnrc_ExtendedProductWarrantyAccrualDueInYearThree
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of deferred revenue related to extended product warranty to be recognized in the second fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	gnrc_ExtendedProductWarrantyAccrualDueInYearTwo
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

+ Details

Name:	us-gaap_ExtendedProductWarrantyAccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant