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Note 2 - Revenue - Customer Accounts Receivable (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021
Trade accounts receivable |  | $ 11,846,579 | $ 4,949,900
Unbilled revenue | [1] | 3,476,497 | 1,191,227
Customer credit balances |  | 1,387,836 | 1,539,680
Customer deposits |  | 1,611,093 | 1,571,342
Increase (decrease) in Unbilled revenue | [1] | 2,285,270 |
Increase (decrease) in Customer credit balances |  | (151,844) |
Increase (decrease) in Customer deposits |  | 39,751 |
Trade Accounts Receivable [Member] |  |  |
Trade accounts receivable | [1] | 8,237,566 | $ 3,722,916
Increase (decrease) in Trade accounts receivable | [1] | $ 4,514,650 |
[1] | Included in accounts receivable in the condensed consolidated balance sheet. Amounts shown net of reserve for bad debts.

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