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 9 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Nov. 30, 2017
Finite-Lived Intangible Assets [Line Items]          
Sales returns, basis of estimated returns     3 months    
Term accounts remain open unless management believes a deduction may still be taken     3 years    
Decrease in cooperative advertising recorded as sales incentives $ 133,755   $ 401,350    
Decrease in open cooperative advertising contracts 204,527   613,723    
Summary of Significant Accounting Policies (Textual) [Abstract]          
Shipping costs 1,489,281 $ 1,989,572 4,997,545 $ 6,043,406  
Advertising, cooperative and promotional expenses 816,117 738,635 1,671,605 1,681,999  
Research and development 16,426 16,811 $ 45,819 44,143  
Patents          
Finite-Lived Intangible Assets [Line Items]          
Intangible asset useful life     17 years    
Accounting Standards Update 2015-07          
Summary of Significant Accounting Policies (Textual) [Abstract]          
Deferred income taxes         $ 2,079,988
Reclassification from current deferred tax assets         $ (2,079,988)
Shipping Costs          
Summary of Significant Accounting Policies (Textual) [Abstract]          
Shipping costs $ 217,265 $ 93,566 $ 520,650 $ 271,810