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Note 2 - Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Oct. 23, 2013
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |
Fair value of derivative contracts excluding impact of credit risk | $ (4,392)gnrc_DerivativeAssetsLiabilitiesNetFairValueOfDerivativeContractsExcludingImpactOfCreditRisk |  | $ (1,727)gnrc_DerivativeAssetsLiabilitiesNetFairValueOfDerivativeContractsExcludingImpactOfCreditRisk |
Not Designated as Hedging Instrument [Member] | Cost of Sales [Member] | Commodity Contract [Member] |  |  |  |
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (726)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (326)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  |
Not Designated as Hedging Instrument [Member] | Cost of Sales [Member] | Foreign Exchange Contract [Member] |  |  |  |
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (321)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (42)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  |
Maximum [Member] | Commodity Contract [Member] |  |  |  |
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |
Derivative, Higher Remaining Maturity Range | 18 months |  |  |
Maximum [Member] | Foreign Exchange Contract [Member] |  |  |  |
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |
Derivative, Higher Remaining Maturity Range | 12 months |  |  |
Commodity Contract [Member] |  |  |  |
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |
Derivative, Number of Instruments Held | 3 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 3 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 3 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Foreign Exchange Contract [Member] |  |  |  |
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |
Derivative, Number of Instruments Held | 4 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | 1 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |
Interest Rate Swap [Member] |  |  |  |
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |
Number of New Contracts Entered |  |  |  | 2 gnrc_NumberOfNewContractsEntered / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (1,272)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (500)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |
Commodity And Foreign Currency Contracts [Member] |  |  |  |
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (1,047)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = gnrc_CommodityAndForeignCurrencyContractsMember | $ (368)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = gnrc_CommodityAndForeignCurrencyContractsMember |  |

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- Definition Fair value derivative contracts excluding impact of credit risk. + References No definition available. + Details
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- Details
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- Definition Number of new contracts entered into during the period mentioned. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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X
- Definition High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 + Details
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