Note 7 - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023
Operating Lease, Right-of-Use Asset		$ 1,014	$ 295
Operating Lease, Payments		410	370
General and Administrative Expense [Member]
Operating Lease, Cost		560	510
Other Long-term Operating Leases [Member]
Contractual Obligation		$ 0	$ 0
Office in Novato, California [Member]
Lessee, Operating Lease, Renewal Term (Year)	3 years
Operating Lease, Right-of-Use Asset	$ 1,100
Lease Expiration Date	Jul. 31, 2027