Annual report pursuant to Section 13 and 15(d)

Accounts Receivable and Concentration of Credit Risk (Components of Accounts Receivable) (Details)

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Accounts Receivable and Concentration of Credit Risk (Components of Accounts Receivable) (Details) - USD ($)
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Accounts Receivable and Concentration of Credit Risk [Abstract]      
Trade receivables $ 5,103,823 $ 4,046,733  
Less: allowance for doubtful accounts (33,143) (36,201) $ (38,103)
Less: allowance for sales and payment term discounts (49,623) (37,900)  
Accounts receivable, net $ 5,021,057 $ 3,972,632