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Note 7 - Leases (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Operating Lease, Right-of-Use Asset $ 295 $ 651  
Operating Lease, Payments 370 360  
General and Administrative Expense [Member]      
Operating Lease, Cost $ 510 $ 490  
Office in Novato, California [Member]      
Lessee, Operating Lease, Renewal Term (Year) 3 years    
Operating Lease, Right-of-Use Asset     $ 1,100