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Note 15 - Subsequent Event (Detail) (USD $) | 12 Months Ended |  |  |  | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2008 | Dec. 31, 2011 | Jan. 09, 2013 Subsequent Event [Member] Shares Earned Upon Execution of the Revised Agreement [Member] | Jan. 09, 2013 Subsequent Event [Member] Shares earned upon receipt by the Company [Member] | Jan. 09, 2013 Subsequent Event [Member] Shares earned upon the signing of binding agreements [Member] | Jan. 09, 2013 Subsequent Event [Member] Shares earned upon the commencement of construction [Member] | Mar. 05, 2013 Subsequent Event [Member] Corporate Term Debt [Member] | Mar. 05, 2013 Subsequent Event [Member] Senior Secured Mortgage Loan [Member] | Mar. 05, 2013 Subsequent Event [Member] Convertible Bond [Member] | Mar. 05, 2013 Subsequent Event [Member] | Mar. 31, 2013 Subsequent Event [Member] | Jan. 31, 2013 Subsequent Event [Member] | Jan. 09, 2013 Subsequent Event [Member]
Percentage of Present Value of Project, Paid as Incentive Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%
Common Stock, Capital Shares Reserved for Future Issuance (in Shares) | 1,898,620 |  |  | 100,000 | 100,000 | 100,000 | 100,000 |  |  |  |  |  |  | 400,000
Percentage of Project's Annual Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00%
Number of Milestones for Common Stock Issuances |  |  |  |  |  |  |  |  |  |  |  |  |  | 4
Compensation |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |
Long-term Debt | 63,261,000 |  | 52,036,000 |  |  |  |  | 66,000,000 |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  | 53,500,000 |  |  |  |
Working Capital | (14,000) |  |  |  |  |  |  |  |  |  | 17,500,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 8.00% | 7.00% |  |  |  |
Debt Instrument, Convertible, Conversion Price (in Dollars per share) |  |  |  |  |  |  |  |  |  | $ 8.05 |  |  |  |
Lease Term on Railroad Use |  | 99 years |  |  |  |  |  |  |  |  |  |  |  |
Payments for (Proceeds from) Loans and Leases |  |  |  |  |  |  |  |  |  |  |  | $ 3,300,000 |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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