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Note 15 - Share Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
May 31, 2013 | May 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 21, 2013 | Jun. 29, 2012 | Feb. 10, 2010
Note 15 - Share Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  |  |  |  |  |  |  |  |  | 9,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Allocated Share-based Compensation Expense |  |  | $ 12,612 us-gaap_AllocatedShareBasedCompensationExpense | $ 12,368 us-gaap_AllocatedShareBasedCompensationExpense | $ 10,780 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  |  | $ 57.21 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice | $ 35.04 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice | $ 21.28 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) | $ 5.00 us-gaap_CommonStockDividendsPerShareDeclared | $ 6.00 us-gaap_CommonStockDividendsPerShareDeclared | $ 0 us-gaap_CommonStockDividendsPerShareDeclared | $ 5.00 us-gaap_CommonStockDividendsPerShareDeclared | $ 6.00 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  | 12,181 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | 15,020 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | 6,425 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation |  |  |  |  |
Employee Stock Option [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Note 15 - Share Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  |  | $ 42.20 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 29.81 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 15.94 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Employee Stock Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Note 15 - Share Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  |  | $ 59.01 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 48.36 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 32.05 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Note 15 - Share Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | 8,509 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 9,034 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 6,835 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 4 years | 4 years | 4 years | 5 years | 5 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  | 10 years | 10 years | 10 years | 10 years | 10 years |  |  |
Shares Paid for Tax Withholding for Share Based Compensation (in Shares) |  |  | 235,644 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 323,427 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 667,041 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  | 10,411 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 8,449 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 6,425 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | 7,794 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 2 years 146 days |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Note 15 - Share Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | 4,103 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 3,074 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 3,645 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |  |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation (in Shares) |  |  | 34,854 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 163,458 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 0 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  | 1,770 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 6,571 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | 5,394 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 2 years 36 days |  |  |  |  |  |  |
Special Cash Dividend 2013 [Member] |  |  |  |  |  |  |  |  |  |
Note 15 - Share Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) |  |  |  |  |  |  |  | $ 5.00 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = gnrc_SpecialCashDividend2013Member |  |
Special Cash Dividend 2012 [Member] |  |  |  |  |  |  |  |  |  |
Note 15 - Share Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) |  |  |  |  |  |  |  |  | $ 6.00 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = gnrc_SpecialCashDividend2012Member |
Board of Directors [Member] |  |  |  |  |  |  |  |  |  |
Note 15 - Share Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Issued (in Shares) |  |  | 8,869 us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued / us-gaap_TitleOfIndividualAxis = gnrc_BoardOfDirectorsMember | 7,291 us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued / us-gaap_TitleOfIndividualAxis = gnrc_BoardOfDirectorsMember | 10,864 us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued / us-gaap_TitleOfIndividualAxis = gnrc_BoardOfDirectorsMember |  |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  |  | $ 509 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_TitleOfIndividualAxis = gnrc_BoardOfDirectorsMember | $ 260 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_TitleOfIndividualAxis = gnrc_BoardOfDirectorsMember | $ 300 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_TitleOfIndividualAxis = gnrc_BoardOfDirectorsMember |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Number of shares issued pursuant to the terms of a deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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