v3.26.1
Note 4 - Fair Value Measurement and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Values on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Warrant liabilities:    
Total warrant liabilities $ 6 $ 102
Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability 6 100
Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability   2
Fair Value, Inputs, Level 1 [Member]    
Warrant liabilities:    
Total warrant liabilities 0 0
Fair Value, Inputs, Level 1 [Member] | Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability 0 0
Fair Value, Inputs, Level 1 [Member] | Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability   0
Fair Value, Inputs, Level 2 [Member]    
Warrant liabilities:    
Total warrant liabilities 0 0
Fair Value, Inputs, Level 2 [Member] | Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability 0 0
Fair Value, Inputs, Level 2 [Member] | Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability   0
Fair Value, Inputs, Level 3 [Member]    
Warrant liabilities:    
Total warrant liabilities 6 102
Fair Value, Inputs, Level 3 [Member] | Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability $ 6 100
Fair Value, Inputs, Level 3 [Member] | Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability   $ 2