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Note 11 - Credit Agreements (Details) - Maturities of long-term Borrowings Outstanding (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Maturities of long-term Borrowings Outstanding [Abstract]  
2015 $ 557us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016 254us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017 185us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018 191us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
After 2018 1,105,332gnrc_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFour
Total $ 1,106,519us-gaap_LongTermDebtNoncurrent