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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Values on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Warrant liabilities:    
Goodwill $ 8,468 $ 8,468
Fair Value, Recurring [Member]    
Warrant liabilities:    
Warrant liability, total 156 174
Goodwill   8,468
Fair Value, Recurring [Member] | Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability 12 12
Fair Value, Recurring [Member] | Series Warrants [Member]    
Warrant liabilities:    
Warrant liability 11 11
Fair Value, Recurring [Member] | Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability 133 151
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Warrant liabilities:    
Warrant liability, total 0 0
Goodwill   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   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 156 174
Goodwill   8,468
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability 12 12
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Series Warrants [Member]    
Warrant liabilities:    
Warrant liability 11 11
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability $ 133 $ 151