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Note 4 - Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 19, 2014 | Oct. 23, 2013 | May 30, 2012
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Fair value of derivative contracts excluding impact of credit risk | $ (1,727)gnrc_DerivativeAssetsLiabilitiesNetFairValueOfDerivativeContractsExcludingImpactOfCreditRisk | $ 1,385 gnrc_DerivativeAssetsLiabilitiesNetFairValueOfDerivativeContractsExcludingImpactOfCreditRisk |  |  |  |
Cost of Sales [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (629)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (605)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 386 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  |  |
Commodity Contract [Member] | Maximum [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Higher Remaining Maturity Range | 18 months |  |  |  |  |
Foreign Exchange Contract [Member] | Maximum [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Higher Remaining Maturity Range | 12 months |  |  |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (149)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | (56)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |  |  |  |
Derivative, Number of Instruments Held |  |  | 0 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Number of Instruments Held |  |  |  |  |  | 4 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Number of New Contracts Entered |  |  |  | 1 gnrc_NumberOfNewContractsEntered / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 2 gnrc_NumberOfNewContractsEntered / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Interest Rate Swap Five [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Floor Interest Rate | 0.75%us-gaap_DerivativeFloorInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnrc_InterestRateSwapFiveMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |
Interest Rate Swap Five [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Inception Date | Oct. 23, 2013 |  |  |  |  |
Derivative Effective Date | Jul. 01, 2014 |  |  |  |  |
Derivative, Maturity Date | Jul. 01, 2018 |  |  |  |  |
Derivative, Notional Amount | 100,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gnrc_InterestRateSwapFiveMember |  |  |  |  |
Derivative, Fixed Interest Rate | 1.737%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnrc_InterestRateSwapFiveMember |  |  |  |  |
Interest Rate Swap Six [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Floor Interest Rate | 0.75%us-gaap_DerivativeFloorInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnrc_InterestRateSwapSixMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |
Interest Rate Swap Six [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Inception Date | Oct. 23, 2013 |  |  |  |  |
Derivative Effective Date | Jul. 01, 2014 |  |  |  |  |
Derivative, Maturity Date | Jul. 01, 2018 |  |  |  |  |
Derivative, Notional Amount | 100,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gnrc_InterestRateSwapSixMember |  |  |  |  |
Derivative, Fixed Interest Rate | 1.742%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnrc_InterestRateSwapSixMember |  |  |  |  |
Interest Rate Swap Seven [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Floor Interest Rate | 0.75%us-gaap_DerivativeFloorInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnrc_InterestRateSwapSevenMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |
Interest Rate Swap Seven [Member] |  |  |  |  |  |
Note 4 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |
Derivative, Inception Date | May 19, 2014 |  |  |  |  |
Derivative Effective Date | Jul. 01, 2014 |  |  |  |  |
Derivative, Maturity Date | Jul. 01, 2018 |  |  |  |  |
Derivative, Notional Amount | $ 100,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gnrc_InterestRateSwapSevenMember |  |  |  |  |
Derivative, Fixed Interest Rate | 1.6195%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnrc_InterestRateSwapSevenMember |  |  |  |  |

X
- Definition Fair value derivative contracts excluding impact of credit risk. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Date the derivative contract become effective, in CCYY-MM-DD format. + 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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X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Period Type: | instant

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeFloorInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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=35706170&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=35706170&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
Name: | us-gaap_DerivativeHigherRemainingMaturityRange1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

X
- 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 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: 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=35706170&loc=SL5579245-113959 + Details
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- Details
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- Details
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- Details
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