Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Narrative (Details)

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Intangible Assets - Narrative (Details)
3 Months Ended
Feb. 28, 2018
USD ($)
product_line
Feb. 28, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]    
Number of product lines with patents | product_line 10  
Amortization Expense $ 97 $ 96
2019 388  
2020 243  
2021 243  
2022 243  
2023 $ 0  
Patents    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset useful life 17 years