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INCOME TAXES AFMC for CBPC exchange - Narrative (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2009 tax_credit | Dec. 31, 2009 Alternative Fuel Mixture Credit [Member] | Jun. 30, 2014 Cellulosic Biofuel Producer Credit [Member] | Dec. 31, 2009 Cellulosic Biofuel Producer Credit [Member] | Mar. 31, 2013 Exchange of Alternative Fuel Tax Benefit [Member] gal
AFMC for CBPC Exchange [Line Items] |  |  |  |  |  |  |  |  |
Number of tax credits |  |  |  |  | 2 |  |  |  |
Tax Credit Amount per Gallon |  |  |  |  |  | 0.50 |  | 1.01 |
Tax payment |  |  |  |  |  |  |  |  | $ 70,000,000
Gallons Exchanged |  |  |  |  |  |  |  |  | 120,000,000
Expected Income Tax Benefit |  |  |  |  |  |  |  |  | 19,000,000
Valuation Allowance | $ 15,574,000 | $ 0 | $ 15,574,000 | $ 0 |  |  | $ 16,000,000 |  |

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- Definition The gallons of alternative fuel mixture credit exchanged for the cellulosic biofuel producer credit. + References No definition available. + Details
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- Definition Number of Tax Credits + References No definition available. + Details
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- Definition A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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