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Note 2 - Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |
Number of Major Customers | 0 gnrc_NumberOfMajorCustomers | 0 gnrc_NumberOfMajorCustomers | 0 gnrc_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 | $ 6,615,000 gnrc_AmortizationOfFinancingCostsAndDebtDiscountPremium | $ 4,772,000 gnrc_AmortizationOfFinancingCostsAndDebtDiscountPremium | $ 3,759,000 gnrc_AmortizationOfFinancingCostsAndDebtDiscountPremium
Deferred Costs Amortization Expense Next Twelve Months | 7,012,000 gnrc_DeferredCostsAmortizationExpenseNextTwelveMonths |  |
Deferred Costs Amortization Expense Year Two | 7,302,000 gnrc_DeferredCostsAmortizationExpenseYearTwo |  |
Deferred Costs Amortization Expense Year Three | 7,550,000 gnrc_DeferredCostsAmortizationExpenseYearThree |  |
Deferred Costs Amortization Expense Year Four | 7,505,000 gnrc_DeferredCostsAmortizationExpenseYearFour |  |
Deferred Costs Amortization Expense Year Five | 7,534,000 gnrc_DeferredCostsAmortizationExpenseYearFive |  |
Goodwill, Impairment Loss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Advertising Expense | 32,352,000 us-gaap_AdvertisingExpense | 19,910,000 us-gaap_AdvertisingExpense | 13,360,000 us-gaap_AdvertisingExpense
Research and Development Expense | 31,494,000 us-gaap_ResearchAndDevelopmentExpense | 29,271,000 us-gaap_ResearchAndDevelopmentExpense | 23,499,000 us-gaap_ResearchAndDevelopmentExpense
Long-term Debt | 1,080,599,000 us-gaap_LongTermDebt |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |
Debt Instrument, Fair Value Disclosure | $ 1,048,165,000 us-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 |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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