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Note 5 - Other Comprehensive Income (Loss) - Changes in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Unrealized losses on available-for-sale securities before tax | $ (309) | $ 0 | $ (1,241) | $ 0
Unrealized losses on available-for-sale securities | (74) |  | (281) |
Unrealized losses on available-for-sale securities net of tax | (235) |  | (960) |
Other comprehensive loss before tax | (309) | 0 | (1,241) | 0
Other comprehensive loss | (74) | 0 | (281) | 0
Other comprehensive loss net of tax | $ (235) | $ 0 | $ (960) | $ 0

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