Note 5 - Trade Accounts and Notes Receivable - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Beginning of period	$ 92	$ 689	$ 125	$ 591
Provision for credit losses	12	98	55	384
Recoveries	(34)	(81)	(106)	(247)
Write-offs	0	0	(7)	(6)
Currency translation	(3)	0	0	(16)
End of period	$ 67	$ 706	$ 67	$ 706