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Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Investment securities:	$ 137,669	$ 144,306
Fair Value, Inputs, Level 3 [Member]
Investment securities:	$ 0	$ 0

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

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Namespace Prefix:
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Balance Type:
Period Type: