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Note 10 - Product Warranty Obligations - Recognition of Deferred Revenue Related to Extended Warranties (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Remainder of 2018 | $ 3,187 |  |  |  |  |
2019 | 12,941 |  |  |  |  |
2020 | 12,566 |  |  |  |  |
2021 | 10,821 |  |  |  |  |
2022 | 8,502 |  |  |  |  |
After 2022 | 16,904 |  |  |  |  |
Total | $ 64,921 | $ 63,007 | $ 57,854 | $ 54,189 | $ 43,356 | $ 36,139

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- Definition Amount of deferred revenue related to extended product warranty to be recognized after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | gnrc_ExtendedProductWarrantyAccrualDueAfterYearFive
Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred revenue related to extended product warranty to be recognized in the remainder of the fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | gnrc_ExtendedProductWarrantyAccrualDueInRemainderOfFiscalYear
Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred revenue related to extended product warranty to be recognized in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | gnrc_ExtendedProductWarrantyAccrualDueInYearFive
Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred revenue related to extended product warranty to be recognized in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | gnrc_ExtendedProductWarrantyAccrualDueInYearFour
Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred revenue related to extended product warranty to be recognized in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | gnrc_ExtendedProductWarrantyAccrualDueInYearThree
Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred revenue related to extended product warranty to be recognized in the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | gnrc_ExtendedProductWarrantyAccrualDueInYearTwo
Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
Name: | us-gaap_ExtendedProductWarrantyAccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant