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Accrued Expenses (Details) - USD ($)
Nov. 30, 2019
Nov. 30, 2018
Schedule of accrued expenses (Textual)    
Commissions $ 233,784 $ 228,199
Preferred stock dividends 146,569 141,569
Other accrued expenses 200,848 233,435
Total $ 581,201 $ 603,203