Note 7 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023
Operating Lease, Right-of-Use Asset	$ 676	$ 1,014
Operating Lease, Payments	390	410
General and Administrative Expense [Member]
Operating Lease, Cost	530	$ 560
Other Long-term Operating Leases [Member]
Contractual Obligation	$ 0			$ 0
Office in Novato, California [Member]
Lessee, Operating Lease, Renewal Term (Year)			3 years
Lease Expiration Date		Jul. 31, 2027
Operating Lease, Right-of-Use Asset			$ 1,100