Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Narrative (Details)

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Intangible Assets - Narrative (Details)
3 Months Ended 9 Months Ended
Aug. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Aug. 31, 2017
USD ($)
product_line
Aug. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Number of product lines | product_line     10  
Amortization Expense $ 97 $ 97 $ 291 $ 291
2017 388   388  
2018 388   388  
2019 388   388  
2020 243   243  
2021 $ 243   $ 243  
Patents        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset useful life     17 years