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Legal Contingencies (Details) (USD $) | 1 Months Ended | 3 Months Ended | 1 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
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Aug. 31, 2012 | Dec. 31, 2011 | Jan. 31, 2009 | Sep. 30, 2007 | Jul. 31, 2012 | Sep. 30, 2007 Tampa Bay Nutraceutical Company [Member] | Aug. 31, 2012 Payment received from the parent company of Delta-T [Member] | Oct. 31, 2012 Amount of claim of indebt [Member] | Jan. 31, 2013 Amount Included in Cost of Revenue [Member] | Dec. 31, 2011 Delta T Corporation [Member] | Apr. 30, 2009 Delta T Corporation [Member] | Apr. 30, 2009 GPS [Member] | Jan. 31, 2009 GPS [Member] | Jan. 31, 2013 GPS [Member] | Jan. 31, 2009 GPS [Member] Procurement and Construction Services Related to Nebraska Project [Member] | Mar. 31, 2008 GPS [Member] Procurement and Construction Services Related to Nebraska Project [Member]
Legal Contingencies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of claim of indebt |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  | $ 23,800,000
Net sale proceeds held by Bankruptcy Court |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,500,000 |  |
Settlement payment made by GPS to Delta-T under the Project Close-Out Agreement |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 |  |  |
Amount of lien rights assigned by Delta-T to GPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,200,000 |
Arbitration award in favor of DCR against Delta-T |  |  |  |  |  |  |  |  |  |  |  | 6,800,000 |  |  |  |
Lawsuit Filing Dates |  |  |  | September, 2007 |  |  |  |  |  | December, 2011 | April, 2009 |  |  |  |  |
Damages sought |  |  |  |  |  | 42,000,000 |  |  |  |  |  |  |  |  |  |
Damages sought by DCR from GPS |  | $6.1 million plus interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allegations by Tampa Bay |  |  |  | Tampa Bay alleges compensatory damages in excess of $42 million |  |  |  |  |  |  |  |  |  |  |  |
Provisions for Loss |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Assignment to GPS of first receipts of Delta-T |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amended amount of complaint filed against surety bonding company by DCR |  |  |  |  |  |  |  |  |  |  | 6,800,000 |  |  |  |  |
Total payment made | 1,875,000 |  |  |  |  |  | 275,000 |  |  |  |  |  |  |  |  |
Amount included in cost of revenue |  |  |  |  | 1,600,000 |  |  |  | 1,600,000 |  |  |  |  |  |  |
Award sanctioned by court to VLI | $ 295,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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