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Note 15 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Amount Financed by Dealers | $ 36.2 | $ 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