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Note 9 - Net Income (Loss) Per Share Attributable to Common Shareholders - Anti-dilutive Stocks (Details) - shares
6 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-Based Payment Arrangement, Option [Member]        
Antidilutive Securities (in shares) 1,178,065 573,201 729,712 613,201
Warrant [Member]        
Antidilutive Securities (in shares) 1,743,891 2,945,452 1,743,891 5,551,059
Series C Convertible Preferred Stock [Member]        
Antidilutive Securities (in shares) 0 350 0 350
Contingently Issuable Shares Associated With Acquired Business [Member]        
Antidilutive Securities (in shares) 0 216,590 0 216,590