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Note 8 - Credit Agreements (Details) - Short-term Borrowings (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Short-term borrowings $ 3,103us-gaap_ShortTermBorrowings $ 5,359us-gaap_ShortTermBorrowings
ABL Revolving Credit Facility [Member]    
Short-term Debt [Line Items]    
Short-term borrowings 0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= gnrc_ABLRevolvingCreditFacilityMember
0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= gnrc_ABLRevolvingCreditFacilityMember
Other Lines of Credit [Member]    
Short-term Debt [Line Items]    
Short-term borrowings $ 3,103us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= gnrc_OtherLinesOfCreditMember
$ 5,359us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= gnrc_OtherLinesOfCreditMember