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
Dec. 31, 2005
Feb. 28, 2013
Compensation_Plan
Deliverable
Feb. 29, 2012
Nov. 30, 2012
Basis of Presentation (Additional Textual) [Abstract]        
Number of deliverables for revenue recognized   2    
Valuation allowance   $ 10,812,000   $ 10,947,000
U.S. Income tax expense   0 0  
Foreign income tax expense   42,000 57,000  
Minimum percentage probability of realized tax benefit on settlement   50.00%    
Provisions for interest or penalties related to uncertain tax positions   0 0  
Stock option compensation expense   90,000 259,000  
Number of share based compensation plans   3    
Employee service share based compensation cost recognized   0    
Purchase trading equity securities   0   20,760
Payment Warranty 50,000      
Increased payment warranty   75,000    
Additional payment warranty   10,000    
Reserves recorded under programs   14,756   14,485
Provision for interest or penalties related to uncertain tax position   0    
Number of employee stock based compensation plan   3    
Deferred revenue recognition period   12 months    
Impairment on Long lived assets   $ 0    
Minimum [Member]
       
Basis of Presentation (Textual) [Abstract]        
Contracted storage periods   1 year    
Maximum [Member]
       
Basis of Presentation (Textual) [Abstract]        
Contracted storage periods   21 years