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Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets	$ 45,452us-gaap_DefinedBenefitPlanFairValueOfPlanAssets	$ 42,440us-gaap_DefinedBenefitPlanFairValueOfPlanAssets	$ 36,570us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets	42,267us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_MutualFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	39,759us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_MutualFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Mutual Fund [Member]
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets	42,267us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_MutualFundMember	39,759us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_MutualFundMember
Other Investment [Member] | Fair Value, Inputs, Level 3 [Member]
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets	3,185us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_OtherInvestmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Other Investment [Member]
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets	3,185us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_OtherInvestmentMember
Collective Trust [Member] | Fair Value, Inputs, Level 2 [Member]
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets		2,681us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_CollectiveTrustMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Collective Trust [Member]
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets		2,681us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_CollectiveTrustMember
Fair Value, Inputs, Level 1 [Member]
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets	42,267us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	39,759us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets		2,681us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]
Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items]
Fair value of plan assets	$ 3,185us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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