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Note 14 - Subsequent Events (Details Textual) - USD ($) $ in Thousands	Nov. 02, 2016	May 29, 2015	Mar. 30, 2015	Oct. 24, 2016	Aug. 05, 2015
Subsequent Event [Member] | Term Loan [Member]
Repayments of Long-term Debt	$ 25,000
Subsequent Event [Member]
Stock Repurchase Program, Authorized Amount				$ 250,000
Term Loan [Member]
Repayments of Long-term Debt		$ 100,000	$ 50,000
Stock Repurchase Program, Authorized Amount					$ 200,000

X

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_LongtermDebtTypeAxis=gnrc_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: