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Note 5 - Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Comprehensive Income (Loss) [Table Text Block] |
|  | Unrealized Losses on Available-for-Sale Securities |  |  | Foreign Currency Translation Adjustments |  |  | Total |
Balance at October 1, 2021 |  | $ | (15 | ) |  | $ | (16,305 | ) |  | $ | (16,320 | )
Other comprehensive income |  |  | — |  |  |  | 1,007 |  |  |  | 1,007 |
Balance at September 30, 2022 |  | $ | (15 | ) |  |  | (15,298 | ) |  |  | (15,313 | )
Other comprehensive income (loss) |  |  | 4 |  |  |  | (2,515 | ) |  |  | (2,511 | )
Balance at September 30, 2023 |  | $ | (11 | ) |  | $ | (17,813 | ) |  | $ | (17,824 | )

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-1 + Details
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