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Note 7 - Goodwill and Intangibles (Details Textual) - USD ($)	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2023
Goodwill	$ 71,498,000	$ 71,498,000
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount			9.60%
Goodwill, Impairment Loss	0	$ 0
Acquisition of the Honolulu, Hawaii Branch Office of the Bank of the Orient [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 729,000
Core Deposits [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	8 years
Core Deposits [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years

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