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Note 13 - Income Taxes (Details) - Unrecognized Tax Benefits (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Unrecognized Tax Benefits [Abstract] |
Unrecognized tax benefit, beginning of period | $ 0 us-gaap_UnrecognizedTaxBenefits
Increase in unrecognized tax benefit for positions taken in current period | 6,394 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Unrecognized tax benefit, end of period | $ 6,394 us-gaap_UnrecognizedTaxBenefits

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- Details
Name: | gnrc_UnrecognizedTaxBenefitsAbstract
Namespace Prefix: | gnrc_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefits
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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Period Type: | duration