Note 9 - Derivatives and Hedging Activities - Schedule of Offsetting of Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Gross amounts of recognized assets	$ 5,416	$ 7,728
Derivative assets	5,416	7,728
Derivatives asset cash collateral received	3,670	4,210
Net Amount	1,746	3,518
Derivative Fair Value Of Derivative Liability	2,394	3,712
Derivative liabilities	2,394	3,712
Derivative Collateral Right To Reclaim Securities	0	0
Derivative Collateral Right To Reclaim Cash	0	0
Derivative Fair Value Of Derivative Liability Net Offset Against Collateral	$ 2,394	$ 3,712