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Note 2 - Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 2 - Significant Accounting Policies (Details) [Line Items]      
Number of Major Customers 0gnrc_NumberOfMajorCustomers 0gnrc_NumberOfMajorCustomers 0gnrc_NumberOfMajorCustomers
Percentage of Revenue Considered for Accounting of Major Customer 8.00%gnrc_PercentageOfRevenueConsideredForAccountingOfMajorCustomer 6.00%gnrc_PercentageOfRevenueConsideredForAccountingOfMajorCustomer 7.00%gnrc_PercentageOfRevenueConsideredForAccountingOfMajorCustomer
Amortization of Financing Costs and Debt Discount Premium $ 6,615,000gnrc_AmortizationOfFinancingCostsAndDebtDiscountPremium $ 4,772,000gnrc_AmortizationOfFinancingCostsAndDebtDiscountPremium $ 3,759,000gnrc_AmortizationOfFinancingCostsAndDebtDiscountPremium
Deferred Costs Amortization Expense Next Twelve Months 7,012,000gnrc_DeferredCostsAmortizationExpenseNextTwelveMonths    
Deferred Costs Amortization Expense Year Two 7,302,000gnrc_DeferredCostsAmortizationExpenseYearTwo    
Deferred Costs Amortization Expense Year Three 7,550,000gnrc_DeferredCostsAmortizationExpenseYearThree    
Deferred Costs Amortization Expense Year Four 7,505,000gnrc_DeferredCostsAmortizationExpenseYearFour    
Deferred Costs Amortization Expense Year Five 7,534,000gnrc_DeferredCostsAmortizationExpenseYearFive    
Goodwill, Impairment Loss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Advertising Expense 32,352,000us-gaap_AdvertisingExpense 19,910,000us-gaap_AdvertisingExpense 13,360,000us-gaap_AdvertisingExpense
Research and Development Expense 31,494,000us-gaap_ResearchAndDevelopmentExpense 29,271,000us-gaap_ResearchAndDevelopmentExpense 23,499,000us-gaap_ResearchAndDevelopmentExpense
Long-term Debt 1,080,599,000us-gaap_LongTermDebt    
Fair Value, Inputs, Level 2 [Member]      
Note 2 - Significant Accounting Policies (Details) [Line Items]      
Debt Instrument, Fair Value Disclosure $ 1,048,165,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Accounts Receivable [Member]      
Note 2 - Significant Accounting Policies (Details) [Line Items]      
Concentration Risk, Percentage 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember		 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember