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Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, Rate in Thousands, $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022 | May 14, 2021 | Jul. 31, 2016 | Oct. 27, 2014
Preferred Stock, Shares Authorized (in shares) | 1,000,000 |  | 1,000,000 |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  | $ 0.001 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 700 |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 2 years 2 months 12 days |  |  |  |  |
Warrants Exercisable Term (Month) | 6 months |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 50,000 | 5,000 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value | $ 0 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) | 8 years 3 months 18 days |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year) | 7 years 9 months 18 days |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value | $ 0 |  |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 1,192,094 |  | 1,157,927 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 50,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate (Rate) | 0.00% |  |  |  |  |
Share-Based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share) | $ 1.34 | $ 4.11 |  |  |  |
Share-Based Payment Arrangement, Tranche Three [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 3 years | 3 years |  |  |  |
Montage Warrant [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 8 years |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 132.50 |  |  |  |  |
Class of Warrant or Right, Equity Buy-out | $ 250 |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years 6 months |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 4.00 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 872,625 |  |  |  |  |
Series B Warrants [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 24 months |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 4.00 |  |  |  |
Series C Warrants [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years 6 months |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 0.05 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 13,738 |  |  |  |  |
Placement Agent Warrants [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 5 years |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 4.00 |  | $ 2.85 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 179,536 |  |  | 179,536 |  |
Warrants or Rights, Exercised During Period (in shares) | 0 | 26,605 |  |  |  |
Series C Preferred Placement Agent Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 11,992 |  |  |  |  |
Investor Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 41,621 |  |  |  |  |
Series D Preferred Stock Warrants [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 5 years 6 months |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 2.51 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 592,106 |  |
Series D Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 592,106 |  |  |  |  |
Warrants or Rights, Exercised During Period (in shares) | 0 |  |  |  |  |
Amended and Restated Stock Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  | 5,000 |
The 2016 Stock Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 1,650,000 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 1,192,094 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 204,907 |  |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  | 264,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  | $ 10
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | 0 |  | 0 |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) | 5,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 1,000 |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | 0 |  | 0 |  |  |
Series C Convertible Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) | 11,000 |  | 11,000 |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 1,000 |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | 350 |  | 350 |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) | 38,889 |  | 38,889 |  |  |
Series D Convertible Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 1,000 |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | 0 |  | 0 | 4,200 |  |
Convertible Preferred Stock, Percent, Maximum Ownership |  |  |  | 4.99% |  |
Convertible Preferred Stock, Percent, Maximum Ownership Upon Election |  |  |  | 9.99% |  |

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