Note 15 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Share-Based Payment Arrangement, Expense	$ 513	$ 737	$ 933	$ 1,295
Cost of Sales [Member]
Share-Based Payment Arrangement, Expense	33	28	61	43
Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense	447	686	820	1,217
Research and Development Expense [Member]
Share-Based Payment Arrangement, Expense	$ 33	$ 23	$ 52	$ 35