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Note 16 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Amount Financed by Dealers | $ 45.7 | $ 49.6

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