v3.25.4
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
Dec. 31, 2025
Sep. 30, 2025
Warrant liabilities:    
Warrant liability, total   $ 102
Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability $ 12 100
Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability   2
Fair Value, Inputs, Level 1 [Member]    
Warrant liabilities:    
Warrant liability, total   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:    
Warrant liability, total   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:    
Warrant liability, total   102
Fair Value, Inputs, Level 3 [Member] | Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability $ 12 100
Fair Value, Inputs, Level 3 [Member] | Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability   $ 2