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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) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2022
Sep. 30, 2022
Warrant liabilities:    
Warrant liability, total $ 452 $ 749
Contingent consideration obligations   250
Total liabilities   999
Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability 12 12
Series Warrants [Member]    
Warrant liabilities:    
Warrant liability 113 234
Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability 327 503
Fair Value, Inputs, Level 1 [Member]    
Warrant liabilities:    
Warrant liability, total
Contingent consideration obligations   0
Total liabilities   0
Fair Value, Inputs, Level 1 [Member] | Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability 0 0
Fair Value, Inputs, Level 1 [Member] | Series Warrants [Member]    
Warrant liabilities:    
Warrant liability 0 0
Fair Value, Inputs, Level 1 [Member] | Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability 0 0
Fair Value, Inputs, Level 2 [Member]    
Warrant liabilities:    
Warrant liability, total
Contingent consideration obligations   0
Total liabilities   0
Fair Value, Inputs, Level 2 [Member] | Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability 0 0
Fair Value, Inputs, Level 2 [Member] | Series Warrants [Member]    
Warrant liabilities:    
Warrant liability 0 0
Fair Value, Inputs, Level 2 [Member] | Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability 0 0
Fair Value, Inputs, Level 3 [Member]    
Warrant liabilities:    
Warrant liability, total 452 749
Contingent consideration obligations   250
Total liabilities   999
Fair Value, Inputs, Level 3 [Member] | Montage Warrant [Member]    
Warrant liabilities:    
Warrant liability 12 12
Fair Value, Inputs, Level 3 [Member] | Series Warrants [Member]    
Warrant liabilities:    
Warrant liability 113 234
Fair Value, Inputs, Level 3 [Member] | Series D Warrants [Member]    
Warrant liabilities:    
Warrant liability $ 327 $ 503