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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
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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

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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