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