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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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