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Note 20 - Major Customers, Suppliers and Related Information (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Revenue from Contract with Customer, Including Assessed Tax	$ 11,301	$ 8,276	$ 19,329	$ 17,058
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 8,086	$ 6,411	$ 13,837	$ 12,923
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number Of Major Customers	1	1	1	1
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage	47.00%	64.00%	49.00%	63.00%
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	33.00%	63.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer 2 [Member]
Concentration Risk, Percentage	25.00%	15.00%

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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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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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