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Note 13 - Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax Credit Carryforward, State Research and Development	$ 15,610gnrc_TaxCreditCarryforwardStateResearchAndDevelopment
Tax Credit Carryforward, State Manufacturing	2,424gnrc_TaxCreditCarryforwardStateManufacturing
Unrecognized Tax Benefits, Interest on Income Taxes Expense	86us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Unrecognized Tax Benefits, Income Tax Penalties Expense	263us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense
Undistributed Earnings of Foreign Subsidiaries	$ 9,139us-gaap_UndistributedEarningsOfForeignSubsidiaries

X

- Definition

The amount of the state manufacturing tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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- Definition

The amount of the state research and development credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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- Definition

Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return.

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