Note 15 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Share-Based Payment Arrangement, Expense	$ 524	$ 513	$ 970	$ 933
Cost of Sales [Member]
Share-Based Payment Arrangement, Expense	28	19	42	29
Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense	439	453	827	831
Research and Development Expense [Member]
Share-Based Payment Arrangement, Expense	$ 57	$ 41	$ 101	$ 73