Note 12 - Leases - Initial Measurement of Operating Lease (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023
Operating lease ROU assets as of September 30, 2022	$ 3,886
Operating lease liabilities as of September 30, 2022	5,291
Less amortization of operating lease ROU assets	(387)	$ (385)
Additional operating lease liabilities	(499)
Effect of exchange rate on operating lease ROU assets	8
Effect of exchange rate on operating lease liabilities	8
Operating lease ROU assets as of March 31, 2023	3,507
Operating lease liabilities as of March 31, 2023	4,800
Less non-current portion	(3,773)		$ (4,283)
Operating lease liabilities, current portion	$ 1,027		$ 1,008