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Note 1 - Significant Accounting Policies (Details Textual)	3 Months Ended		6 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)
Cash and Cash Equivalent	$ 8,294,000		$ 8,294,000		$ 6,895,000
Credit Terms for Trade Receivables (Day)			30 days
Extended Credit Terms for Trade Receivables (Day)			60 days
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	17,200,000		$ 17,200,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
Accounts and Financing Receivable, after Allowance for Credit Loss	9,700,000		$ 9,700,000
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	800,000	$ 2,300,000	$ 19,500,000	$ 33,700,000
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
Revenue from Contract with Customer, Including Assessed Tax	33,000	$ 3,200,000	75,000,000,000	$ 6,700,000
Subsidiaries [Member] | Non-US [Member]
Cash and Cash Equivalent	$ 700,000		$ 700,000		$ 1,100,000

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