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Note 5 - Fair Value Measurement and Fair Value of Financial Instruments - Changes in Contingent Consideration and Warrant Liabilities (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Contingent Consideration [Member]    
Balance $ 3,649 $ 0
Additions 0 3,479
Exercises or payments (2,768) 0
Adjustment to fair value (631) 170
Balance 250 3,649
Warrant [Member]    
Balance 4,404 2,486
Additions 0 1,319
Exercises or payments 0 (5,286)
Adjustment to fair value (3,655) 5,885
Balance $ 749 $ 4,404