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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Feb. 02, 2012 | Dec. 31, 2005 | Feb. 28, 2014 Deliverables CompensationPlan | Feb. 28, 2013 | Nov. 30, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |
Number of deliverables for revenue recognized |  |  | 2 |  |
Deferred revenue recognition period |  |  | 12 months |  |
Valuation allowance |  |  | $ 10,590,000 |  | $ 10,852,000
U.S. Income tax expense |  |  | 0 | 0 |
Foreign income tax expense |  |  | 47,000 | 42,000 |
Minimum percentage probability of realized tax benefit on settlement |  |  | 50.00% |  |
Provisions for interest or penalties related to uncertain tax positions |  |  | 0 | 0 |
Uncertain tax provisions |  |  | 0 | 0 |
Impairment on long lived assets |  |  | 0 |  |
Number of employee stock based compensation plan |  |  | 3 |  |
Stock option compensation expense |  |  | 152,000 | 90,000 |
Unrealized holding gain |  |  | 15,525 | (380) |
Payment warranty |  | 50,000 |  |  |
Increased payment warranty | 75,000 |  |  |  |
Additional payment warranty | 10,000 |  |  |  |
Reserves recorded under programs |  |  | 15,857 |  | 15,608
Mexico [Member] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |
Note receivable |  |  | $ 550,782 |  |
Minimum [Member] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |
Contracted storage periods |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |
Contracted storage periods |  |  | 21 years |  |

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