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Note 7 - Product Warranty Obligations (Details) - Reconciliation of Product Warranty Liability (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Reconciliation of Product Warranty Liability [Abstract] |  |
Balance at beginning of period | $ 30,909 us-gaap_StandardProductWarrantyAccrual | $ 33,734 us-gaap_StandardProductWarrantyAccrual
Payments | (5,433)us-gaap_StandardProductWarrantyAccrualPayments | (6,723)us-gaap_StandardProductWarrantyAccrualPayments
Provision for warranties issued | 4,549 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued | 6,039 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Changes in estimates for pre-existing warranties | (748)us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease | (1,143)us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease
Balance at end of period | 29,277 us-gaap_StandardProductWarrantyAccrual | 31,907 us-gaap_StandardProductWarrantyAccrual
Balance at beginning of period | 27,193 us-gaap_ExtendedProductWarrantyAccrual | 23,092 us-gaap_ExtendedProductWarrantyAccrual
Deferred revenue on extended warranty contracts sold | 1,380 us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued | 2,219 us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued
Amortization of deferred revenue on extended warranty contracts | (1,042)gnrc_AmortizationOfDeferredRevenueOnExtendedWarrantyContracts | (679)gnrc_AmortizationOfDeferredRevenueOnExtendedWarrantyContracts
Balance at end of period | $ 27,531 us-gaap_ExtendedProductWarrantyAccrual | $ 24,632 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=51674963&loc=d3e12565-110249 + Details
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X
- 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=51674963&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=51674963&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=51674963&loc=d3e12565-110249 + Details
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X
- 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=51674963&loc=d3e12565-110249 + Details
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X
- 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=51674963&loc=d3e12565-110249 + Details
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