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Note 5 - Segment Reporting (Details) - Net Sales by Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revenue from External Customer [Line Items] |  |
Net sales | $ 311,818 us-gaap_SalesRevenueNet | $ 342,008 us-gaap_SalesRevenueNet
Residential Power Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales | 156,835 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_ResidentialPowerProductsMember | 163,969 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_ResidentialPowerProductsMember
Commercial and Industrial Power Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales | 133,763 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_CommercialAndIndustrialPowerProductsMember | 157,370 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_CommercialAndIndustrialPowerProductsMember
Other Products and Services [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 21,220 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_OtherProductsAndServicesMember | $ 20,669 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_OtherProductsAndServicesMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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