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Note 5 - Short-term Investments (Details Textual) Pure in Thousands	12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Short-Term Investments	$ 0	$ 30,227,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions		0
Debt Securities, Realized Gain (Loss)	$ 9,000	$ 0
Debt Securities [Member] | Prepaid Expenses and Other Current Assets [Member]
Interest Receivable, Current		$ 300,000

X

- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
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Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

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