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Note 13 - Income Taxes (Details) - Net Current and Noncurrent Components of Deferred Taxes (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Net Current and Noncurrent Components of Deferred Taxes [Abstract]
Net current deferred tax assets	$ 22,841us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent	$ 26,869us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Net long-term deferred tax assets	47,894gnrc_DeferredTaxAssetsLiabilitiesNoncurrent	86,125gnrc_DeferredTaxAssetsLiabilitiesNoncurrent
Net long-term deferred tax liabilities	(13,449)us-gaap_DeferredTaxLiabilitiesNoncurrent	(14,966)us-gaap_DeferredTaxLiabilitiesNoncurrent
Valuation allowance	(1,385)us-gaap_DeferredTaxAssetsValuationAllowance	(1,021)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets	$ 55,901us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 97,007us-gaap_DeferredTaxAssetsLiabilitiesNet

X

- Definition

Amount of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

No definition available.

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

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-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318



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-Name Accounting Standards Codification

-Topic 740

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

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