XML 31 R81.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Income Taxes (Narrative) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Income Taxes [Abstract] |  |
Deferred tax valuation allowance | $ 3,742,000 us-gaap_DeferredTaxAssetsValuationAllowance | $ 3,765,000 us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax valuation allowance, state | 3,700,000 gpre_DeferredTaxAssetsValuationAllowanceState |
Net operating loss carryforwards, federal |  | $ 30,500,000 us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward

X
- Definition Deferred Tax Assets Valuation Allowance, State + References No definition available. + Details
Name: | gpre_DeferredTaxAssetsValuationAllowanceState
Namespace Prefix: | gpre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of an unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount is presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset is not used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31996-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28638-109314 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31986-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28619-109314 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant