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Note 3 - Revenue - Customer Accounts Receivable (Details) - USD ($)
6 Months Ended
Mar. 31, 2022
Sep. 30, 2021
Trade accounts receivable $ 10,997,174 $ 4,949,900
Unbilled revenue [1] 3,057,298 1,191,227
Customer credit balances 682,959 1,539,680
Customer deposits 1,583,542 1,571,342
Increase (decrease) in Unbilled revenue [1] 1,866,071  
Increase (decrease) in Customer credit balances (856,721)  
Increase (decrease) in Customer deposits 12,200  
Trade Accounts Receivable [Member]    
Trade accounts receivable [1] 7,872,022 $ 3,722,916
Increase (decrease) in Trade accounts receivable [1] $ 4,149,106  
[1] Included in accounts receivable in the condensed consolidated balance sheet. Amounts shown net of reserve for credit losses.