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Note 14 - Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employer Contribution under Medical and Dental Plan	$ 14,992	$ 15,019	$ 14,352
Defined Benefit Plan, Amortization of Gain (Loss)	$ (883)	(941)	(1,228)
Equity and Real Estate [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	65.00%
Equity and Real Estate [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	85.00%
Savings Plan 401(k) [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan Percentage of Eligible Compensation	6.00%
Defined Contribution Plan, Cost	$ 3,600	$ 3,400	$ 3,000
Pension Plan [Member]
Defined Benefit Plan, Amortization of Gain (Loss)	(883)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	802
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 319

X

- Definition

Percentage of eligible compensation of employees under defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contribution made under medical and dental plan made by the employer.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(4)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

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X

- Definition

Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (s)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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X

- Definition

Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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X

- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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Period Type:

X

- Details

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