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Note 9 - Net Income (Loss) Per Share Attributable to Common Shareholders - Anti-dilutive Stocks (Details) - shares
3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Share-Based Payment Arrangement, Option [Member]    
Antidilutive Securities (in shares) 1,192,094 244,348
Warrant [Member]    
Antidilutive Securities (in shares) 1,744,416 976,520
Series C Convertible Preferred Stock [Member]    
Antidilutive Securities (in shares) 38,889 0