Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)

v2.4.0.8
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