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Note 10 - Product Warranty Obligations (Details) - Reconciliation of Product Warranty Liability (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation of Product Warranty Liability [Abstract] |  |  |
Balance at beginning of year | $ 33,734 us-gaap_StandardProductWarrantyAccrual | $ 36,111 us-gaap_StandardProductWarrantyAccrual | $ 24,643 us-gaap_StandardProductWarrantyAccrual
Payments | (20,615)us-gaap_StandardProductWarrantyAccrualPayments | (18,484)us-gaap_StandardProductWarrantyAccrualPayments | (19,801)us-gaap_StandardProductWarrantyAccrualPayments
Provision for warranties issued | 22,890 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued | 33,707 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued | 34,173 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Changes in estimates for pre-existing warranties | (5,100)us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease | (17,600)us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease | (2,904)us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease
Balance at end of year | 30,909 us-gaap_StandardProductWarrantyAccrual | 33,734 us-gaap_StandardProductWarrantyAccrual | 36,111 us-gaap_StandardProductWarrantyAccrual
Balance at beginning of year | 23,092 us-gaap_ExtendedProductWarrantyAccrual | 13,474 us-gaap_ExtendedProductWarrantyAccrual | 9,737 us-gaap_ExtendedProductWarrantyAccrual
Deferred revenue on extended warranty contracts sold | 7,343 us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued | 11,998 us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued | 5,547 us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued
Amortization of deferred revenue on extended warranty contracts | (3,242)gnrc_AmortizationOfDeferredRevenueOnExtendedWarrantyContracts | (2,380)gnrc_AmortizationOfDeferredRevenueOnExtendedWarrantyContracts | (1,810)gnrc_AmortizationOfDeferredRevenueOnExtendedWarrantyContracts
Balance at end of year | $ 27,193 us-gaap_ExtendedProductWarrantyAccrual | $ 23,092 us-gaap_ExtendedProductWarrantyAccrual | $ 13,474 us-gaap_ExtendedProductWarrantyAccrual

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- Definition Represents the aggregate decrease in the liability for accruals related to extended product warranties issued during the reporting period, due to amortization of deferred revenue. + References No definition available. + Details
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- Details
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- 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://www.xbrl.org/2003/role/presentationRef -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=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate increase in the liability for accruals related to extended product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to standard product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard product warranties (including adjustments related to changes in estimates). Does not include any Increase or Decrease in the liability for accruals related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(4)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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