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Note 2 - Revenue - Customer Accounts Receivable (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Sep. 30, 2023
Trade accounts receivable |  | $ 5,229,249 | $ 4,194,934
Unbilled revenue | [1] | 1,423,346 | 1,240,097
Customer credit balances |  | 1,075,453 | 1,972,132
Customer deposits |  | 1,586,618 | 1,476,321
Increase (decrease) in Unbilled revenue | [1] | 183,249 |
Increase (decrease) in Customer credit balances |  | (896,679) |
Increase (decrease) in Customer deposits |  | 110,297 |
Trade Accounts Receivable [Member] |  |  |
Trade accounts receivable | [1] | 3,783,662 | $ 2,782,025
Increase (decrease) in Trade accounts receivable | [1] | $ 1,001,637 |
[1] | Included in accounts receivable in the condensed consolidated balance sheet. Amounts shown net of reserve for credit losses.

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