Note 5 - Trade Accounts and Notes Receivable - Schedule of Trade Accounts and Notes Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022
Trade accounts receivable	$ 16,907		$ 20,282
Allowance for credit losses	(67)	$ (92)	(125)	$ (706)	$ (689)	$ (591)
Total	16,840		20,157
Less current portion	(15,330)		(20,157)
Accounts Receivable, after Allowance for Credit Loss, Noncurrent	$ 1,510		$ 0