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Note 7 - Segment Reporting (Details) - Net Sales by Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 403,997 us-gaap_SalesRevenueNet | $ 352,305 us-gaap_SalesRevenueNet | $ 362,609 us-gaap_SalesRevenueNet | $ 342,008 us-gaap_SalesRevenueNet | $ 376,236 us-gaap_SalesRevenueNet | $ 363,269 us-gaap_SalesRevenueNet | $ 346,688 us-gaap_SalesRevenueNet | $ 399,572 us-gaap_SalesRevenueNet | $ 1,460,919 us-gaap_SalesRevenueNet | $ 1,485,765 us-gaap_SalesRevenueNet | $ 1,176,306 us-gaap_SalesRevenueNet
Residential Power Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 722,206 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_ResidentialPowerProductsMember | 843,727 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_ResidentialPowerProductsMember | 705,444 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_ResidentialPowerProductsMember
Commercial and Industrial Power Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 652,216 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_CommercialAndIndustrialPowerProductsMember | 569,890 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_CommercialAndIndustrialPowerProductsMember | 410,341 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_CommercialAndIndustrialPowerProductsMember
Other Products and Services [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 86,497 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_OtherProductsAndServicesMember | $ 72,148 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_OtherProductsAndServicesMember | $ 60,521 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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