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, 2022	Sep. 30, 2021
Warrant liabilities:
Warrant liability, total	$ 711	$ 4,404
Contingent consideration obligations	2,029	3,649
Total Liabilities	2,740	8,053
Montage Warrant [Member]
Warrant liabilities:
Warrant liability	12	13
Series Warrants [Member]
Warrant liabilities:
Warrant liability	223	2,026
Series D Warrants [Member]
Warrant liabilities:
Warrant liability	476	2,365
Fair Value, Inputs, Level 1 [Member]
Warrant liabilities:
Warrant liability, total
Contingent consideration obligations	0	0
Total Liabilities	0	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	0
Total Liabilities	0	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	711	4,404
Contingent consideration obligations	2,029	3,649
Total Liabilities	2,740	8,053
Fair Value, Inputs, Level 3 [Member] | Montage Warrant [Member]
Warrant liabilities:
Warrant liability	12	13
Fair Value, Inputs, Level 3 [Member] | Series Warrants [Member]
Warrant liabilities:
Warrant liability	223	2,026
Fair Value, Inputs, Level 3 [Member] | Series D Warrants [Member]
Warrant liabilities:
Warrant liability	$ 476	$ 2,365