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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
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Note 14 - Benefit Plans (Details) - Fair Value of Pension Plan's Assets [Line Items] |  |  |
Fair value of plan assets | $ 45,452 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets | $ 42,440 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets | $ 36,570 us-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 | 42,267 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_MutualFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 39,759 us-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 | 42,267 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = gnrc_MutualFundMember | 39,759 us-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 | 3,185 us-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 | 3,185 us-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 |  | 2,681 us-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 |  | 2,681 us-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 | 42,267 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 39,759 us-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 |  | 2,681 us-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 | $ 3,185 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |

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- Definition 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 + Details
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