Note 19 - Major Customers, Suppliers and Related Information (Details Textual) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)
Product sales	$ 5,739	$ 11,213	$ 10,100	$ 21,700
UNITED STATES
Product sales	$ 2,600	$ 8,411	$ 6,224	$ 17,349
Revenue Benchmark [Member] \| Customer Concentration Risk [Member]
Number Of Major Customers	2	2	1	1
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer 1 [Member]
Concentration Risk, Percentage	19.00%	54.00%	11.00%	57.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer 2 [Member]
Concentration Risk, Percentage		12.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Number Of Major Customers			2	2
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer 1 [Member]
Concentration Risk, Percentage			30.00%	26.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer 2 [Member]
Concentration Risk, Percentage			12.00%	23.00%

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details