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Note 2 - Revenue - Customer Accounts Receivable (Details) - USD ($)		12 Months Ended
		Sep. 30, 2025	Sep. 30, 2024
Trade accounts receivable		$ 4,836,982	$ 4,483,739
Unbilled revenue	[1]	1,373,512	1,294,798
Customer credit balances		1,891,161	1,915,859
Customer deposits		1,537,311	1,488,113
Increase (decrease) in Unbilled revenue	[1]	78,714
Increase (decrease) in Customer credit balances		(24,698)
Increase (decrease) in Customer deposits		49,198
Trade Accounts Receivable [Member]
Trade accounts receivable	[1]	3,354,154	$ 3,080,140
Increase (decrease) in Trade accounts receivable	[1]	$ 274,014
[1] Included in "Accounts receivable, net" in the consolidated balance sheet. Amounts shown net of reserve for bad debts.

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- Definition

Amount of increase (decrease) of liability for consideration received or receivable from customer which is not included in the transaction price, when considered is expected to be refunded to customer.

+ References

No definition available.

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