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Note 5 - Trade Accounts and Notes Receivable (Details Textual) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
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Accounts Receivable, after Allowance for Credit Loss, Noncurrent | $ 1,510 | $ 0
Trade Accounts for Sale of Product [Member] |  |
Accounts Receivable, after Allowance for Credit Loss, Noncurrent | $ 1,500 |
Promissory Note for Sale of Product [Member] |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 1,200

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