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Note 19 - Major Customers, Suppliers and Related Information (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Product sales	$ 14,262	$ 14,152	$ 35,962	$ 37,997
UNITED STATES
Product sales	$ 12,177	$ 12,631	$ 29,526	$ 31,466
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number Of Major Customers	1	1	1	1
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer 1 [Member]
Concentration Risk, Percentage	68.00%			70.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage		77.00%	61.00%
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			69.00%	61.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer 2 [Member]
Concentration Risk, Percentage			11.00%	19.00%

X

- Definition

Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.

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No definition available.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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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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