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Note 1 - Description of Business and Basis of Presentation (Details Textual) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Decrease in Deferred Financing Costs [Member] | December 31, 2015 [Member]
Prior Period Reclassification Adjustment	$ 12,965
Decrease in Long-term Borrowings [Member] | December 31, 2015 [Member]
Prior Period Reclassification Adjustment	12,965
Decrease in Deferred Income Taxes Within Current Assets [Member] | December 31, 2015 [Member]
Prior Period Reclassification Adjustment	29,355
Increase in Deferred Income Taxes within Noncurrent Assets [Member] | December 31, 2015 [Member]
Prior Period Reclassification Adjustment	28,139
Decrease in Deferred Income Taxes within Noncurrent Liabilities [Member] | December 31, 2015 [Member]
Prior Period Reclassification Adjustment	$ 1,216
Number of Countries Where Product is Sold by Subsidiary	150

X

- Definition

Represents the number of countries in where the subsidiary sells its products.

+ References

No definition available.

+ Details

Name:	gnrc_NumberOfCountriesWhereProductIsSoldBySubsidiary
Namespace Prefix:	gnrc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Details

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X

- Details

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X

- Details

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