Note 20 - Major Customers, Suppliers and Related Information (Details Textual) $ in Thousands	12 Months Ended
Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Revenue from Contract with Customer, Including Assessed Tax	$ 47,003	$ 43,010
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 37,888	$ 32,765
Revenue Benchmark [Member] \| Customer Concentration Risk [Member]
Number Of Major Customers	1	1
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| One Customer [Member]
Concentration Risk, Percentage	58.00%	63.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Number Of Major Customers	2	2
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| One Customer [Member]
Concentration Risk, Percentage	66.00%	36.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Two Customers [Member]
Concentration Risk, Percentage	18.00%	24.00%

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