Note 5 - Trade Accounts and Notes Receivable (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
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

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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+ Details