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Revenue (Customer Accounts Receivable) (Details) - USD ($)
6 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]    
Unbilled revenue $ 1,539,460 $ 1,236,384
Increase (decrease) in Unbilled revenue 303,076  
Customer credit balances 1,361,720 880,295
Increase (decrease) in Customer credit balances 481,425  
Customer deposits 1,622,779 1,432,031
Increase (decrease) in Customer deposits 190,748  
Capitalized Contract Cost [Line Items]    
Trade accounts receivable 5,455,204 3,870,211
Trade Accounts Receivable [Member]    
Capitalized Contract Cost [Line Items]    
Trade accounts receivable 3,776,033 $ 2,590,702
Increase (decrease) in Trade accounts receivable $ 1,185,331