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Note 16 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating Leases, Rent Expense, Net | $ 4,796 | $ 4,102 | $ 2,457
Amount Financed by Dealers | $ 32,400 | $ 26,100 |

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

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration