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Note 5 - Fair Value Measurement and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Values on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Warrant liabilities:      
Goodwill, net $ 8,468 $ 8,468 $ 15,985
Fair Value, Recurring [Member]      
Warrant liabilities:      
Warrant liability, total 98 174  
Goodwill, net   8,468  
Fair Value, Recurring [Member] | Montage Warrant [Member]      
Warrant liabilities:      
Warrant liability 10 12  
Fair Value, Recurring [Member] | Series Warrants [Member]      
Warrant liabilities:      
Warrant liability 0 11  
Fair Value, Recurring [Member] | Series D Warrants [Member]      
Warrant liabilities:      
Warrant liability 88 151  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Warrant liabilities:      
Warrant liability, total 0 0  
Goodwill, net   0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Montage Warrant [Member]      
Warrant liabilities:      
Warrant liability 0 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Series Warrants [Member]      
Warrant liabilities:      
Warrant liability 0 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Series D Warrants [Member]      
Warrant liabilities:      
Warrant liability 0 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Warrant liabilities:      
Warrant liability, total 0 0  
Goodwill, net   0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Montage Warrant [Member]      
Warrant liabilities:      
Warrant liability 0 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Series Warrants [Member]      
Warrant liabilities:      
Warrant liability 0 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Series D Warrants [Member]      
Warrant liabilities:      
Warrant liability 0 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Warrant liabilities:      
Warrant liability, total 98 174  
Goodwill, net   8,468  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Montage Warrant [Member]      
Warrant liabilities:      
Warrant liability 10 12  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Series Warrants [Member]      
Warrant liabilities:      
Warrant liability 0 11  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Series D Warrants [Member]      
Warrant liabilities:      
Warrant liability $ 88 $ 151