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Note 14 - Net Loss Per Common Share - Antidilutive Securities Excluded from Calculation of Diluted Earnings Per Share (Details) - shares
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Antidilutive securities (in shares) 3,154,845 2,195,528
Liability Warrants [Member]    
Antidilutive securities (in shares) 24,105 24,105
Equity-based Warrants [Member]    
Antidilutive securities (in shares) 2,691,446 1,621,891
Share-based Payment Arrangement, Option [Member]    
Antidilutive securities (in shares) 73,425 156
Restricted Stock [Member]    
Antidilutive securities (in shares) 365,869 234,261
Convertible Preferred Stock [Member]    
Antidilutive securities (in shares) 315,115