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Note 14 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Amount Financed by Dealers	$ 34.6	$ 36.5

X

- Definition

Amount financed by dealers to purchase goods from the entity.

+ References

No definition available.

+ Details

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