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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021
Fair Value Adjustment of Warrants | $ (818) | $ 4,161 | $ (3,693) | $ 6,020 |
Measurement Input, Price Volatility [Member] | Valuation, Market Approach [Member] |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input, Percentage | 40.00% |  | 40.00% |  |
Measurement Input, Price Volatility [Member] | Valuation Technique, Company Specific Volatility [Member] |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.60 |  | 0.60 |  |
Minimum [Member] | Measurement Input, Price Volatility [Member] | Valuation, Market Approach [Member] |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input, Percentage | 26.70% |  | 26.70% |  | 28.80%
Maximum [Member] | Measurement Input, Price Volatility [Member] | Valuation, Market Approach [Member] |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input, Percentage | 65.50% |  | 65.50% |  | 66.20%
Weighted Average [Member] | Measurement Input, Price Volatility [Member] | Valuation, Market Approach [Member] |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input, Percentage | 56.70% |  | 56.70% |  | 55.80%

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