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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.

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