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Note 4 - Fair Value Measurements - Assets Categorized on Basis of Various Levels (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Sep. 30, 2025
Assets, fair value	$ 67,416	$ 66,751
Money Market Funds [Member]
Assets, fair value	67,404	66,739
Mutual Fund Investment [Member]
Assets, fair value	12	12
Cash and Cash Equivalents [Member]
Assets, fair value	67,404	66,739
Marketable Securities [Member]
Assets, fair value	12	12
Fair Value, Inputs, Level 1 [Member]
Assets, fair value	67,416	66,751
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Assets, fair value	67,404	66,739
Fair Value, Inputs, Level 1 [Member] | Mutual Fund Investment [Member]
Assets, fair value	12	12
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Assets, fair value	67,404	66,739
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member]
Assets, fair value	12	12
Fair Value, Inputs, Level 2 [Member]
Assets, fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Assets, fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Mutual Fund Investment [Member]
Assets, fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Assets, fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Marketable Securities [Member]
Assets, fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Assets, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Assets, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Mutual Fund Investment [Member]
Assets, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Assets, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Marketable Securities [Member]
Assets, fair value	$ 0	$ 0

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- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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