Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
3 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Nov. 30, 2016
Finite-Lived Intangible Assets [Line Items]      
Impairments of long-lived assets $ 0 $ 0  
Estimated duration of lag in coupon redemptions 42 days    
Duration of historical returns used to determine reserve for returns 5 months    
Term accounts remain open unless management believes a deduction may still be taken 3 years    
Shipping costs $ 81,466 114,109  
Advertising, cooperative and promotional expenses 482,215 316,906  
Research and development costs 13,082 $ 8,201  
Deferred income taxes $ 2,148,566   $ 2,148,764
Patents      
Finite-Lived Intangible Assets [Line Items]      
Intangible asset useful life 17 years