Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies (Details Textual)

v2.4.0.6
Basis of Presentation and Significant Accounting Policies (Details Textual) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2005
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2012
Directors
Aug. 31, 2011
Nov. 30, 2011
Basis of Presentation and Significant Accounting Policies (Textual) [Abstract]            
Amount transferred to reserve against losses   $ 1,700,000   $ 1,700,000    
Immediate vesting of the options included in stock compensation expense   54,000 314,000 1,073,536 407,244  
Basis of Presentation and Significant Accounting Policies (Additional Textual) [Abstract]            
Valuation allowance   10,541,000   10,541,000   7,756,000
U.S. Income tax expense   0 0 1,718,919 0  
Foreign income tax expense   45,000 39,000 127,000 109,000  
Minimum percentage probability of realized tax benefit on settlement       50.00%    
Number of other persons nominated for election as directors       6    
Provisions for interest or penalties related to uncertain tax positions   0 0 0 0  
Exchange-traded equity securities   20,760   20,760   0
Unrealized holding gain recorded in other income and expense   820        
Unrealized holding loss recorded in other income and expense       6,560    
Variable rate demand notes reset period       7 days    
Payment warranty 50,000          
Increased payment warranty       75,000    
Additional payment warranty       10,000    
Reserves recorded under programs   14,172   14,172   13,351
Maximum [Member]
           
Basis of Presentation and Significant Accounting Policies (Textual) [Abstract]            
Contracted storage periods       21 years    
Minimum [Member]
           
Basis of Presentation and Significant Accounting Policies (Textual) [Abstract]            
Contracted storage periods       1 year    
Variable Rate Demand Notes [Member]
           
Basis of Presentation and Significant Accounting Policies (Textual) [Abstract]            
Variable rate demand notes           1,002,000
Basis of Presentation and Significant Accounting Policies (Additional Textual) [Abstract]            
Available-for-sale Securities, Total           1,002,000
Exchange Traded Equity Securities [Member]
           
Basis of Presentation and Significant Accounting Policies (Textual) [Abstract]            
Variable rate demand notes   0   0   6,404
Basis of Presentation and Significant Accounting Policies (Additional Textual) [Abstract]            
Available-for-sale Securities, Total   0   0   6,404
CEO [Member]
           
Basis of Presentation and Significant Accounting Policies (Textual) [Abstract]            
Immediate vesting of the options included in stock compensation expense       $ 700,000