Note 5 - Trade Accounts and Notes Receivable - Schedule of Trade Accounts and Notes Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022
Trade accounts receivable	$ 17,709		$ 20,282
Allowance for credit losses	(35)	$ (67)	(125)	$ (208)	$ (706)	$ (591)
Total	17,674		20,157
Less current portion	(16,164)		(20,157)
Accounts Receivable, after Allowance for Credit Loss, Noncurrent	$ 1,510		$ 0