Note 1 - Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)
Cash and Cash Equivalent	$ 23,559		$ 23,559		$ 6,895
Credit Terms for Trade Receivables (Day)			30 days
Extended Credit Terms for Trade Receivables (Day)			60 days
Research and Development Expense	4,238	$ 4,011	$ 14,367	$ 11,476
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers			2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member]
Accounts and Financing Receivable, after Allowance for Credit Loss	15,300		$ 15,300
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
Accounts and Financing Receivable, after Allowance for Credit Loss	9,700		$ 9,700
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers			2
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Customer One [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,100	1,300	$ 20,600	35,000
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	$ 3,400	75,000,000	$ 10,100
Subsidiaries [Member] | Non-US [Member]
Cash and Cash Equivalent	$ 1,000		$ 1,000		$ 1,100