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Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, Pure in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 28, 2021 | May 14, 2021 | Feb. 04, 2021 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Nov. 30, 2019 | Oct. 31, 2019 | Jul. 31, 2016 | Oct. 27, 2014
Preferred Stock, Shares Authorized (in shares) |  |  |  | 1,000,000 |  |  | 1,000,000 |  | 1,000,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance of Common Stock, Net of Issuance Costs |  |  |  |  |  |  |  |  | $ 0 | $ 4,626,000 |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 5 years |  |  |  |  | 5 years |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 48,000 |  |  |  | 95,500 |  | 95,500 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  | $ 0.5 |  |  |  |  | $ 0.5 |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  |  | 2 years 3 months 10 days |  |  |  |  |
Warrants Exercisable Term (Month) |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  | $ 1.27 |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  | $ 0 |  |  |  |  | $ 0 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  |  |  | 8 years 8 months 12 days |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  |  |  | 8 years 3 months 18 days |  |  |  |  |
Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  | 5,000 |  |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  | 1,178,065 |  |  | 765,232 |  | 1,178,065 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  | 535,000 |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.82 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |  |  | 3 years | 3 years | 3 years |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share) |  |  |  | $ 3.99 |  |  |  | $ 2.51 | $ 3.99 | $ 2.51 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate (Rate) |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 120,000 |  |  |  |  | 120,000 |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  | $ 1.85 |  |  |  |  |  |  |  |  |  |
Director [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate (Rate) |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 362,000 |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  | $ 1.85 |  |  |  |  |  |  |  |  |  |
Chief Executive Officer [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Amended and Restated Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  | 1,226 |  |  |  |  | 1,226 |  |  |  |  |
The 2016 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 1,650,000 |  |  |  |  | 1,650,000 |  | 800,000 | 10,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  | 1,176,839 |  |  |  |  | 1,176,839 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 423,815 |  |  |  |  | 423,815 |  |  |  |  |
Series D Preferred Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 0.5 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 592,106 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 179,536 | 58,169 |  | 179,536 |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 2.85 | $ 3.875 |  |  | $ 4.00 |  |  |  |  |  |  |  |
Warrants or Rights, Exercised During Period (in shares) |  |  |  |  |  |  |  |  | 26,605 |  |  |  |  |
Montage Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 8 years |  |  |  |  | 8 years |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 132.50 |  |  |  |  | $ 132.50 |  |  |  |  |
Class of Warrant or Right, Equity Buy-out |  |  |  | $ 250,000 |  |  |  |  | $ 250,000 |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 872,625 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 13,738 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
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 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 |  |  |  |  |  |  |  |  |
May 2021 Registered Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 1,060,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 2.28 |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock Agreement, Placement Fee Percentage (Rate) |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Net |  | $ 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |
May 2021 Registered Offering [Member] | Series D Preferred Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Registered Offering and Sale of Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 880,000 |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 3.10 |  |  |  |  |  |  |  |  |  |  |
Sale of Stock Agreement, Placement Fee Percentage (Rate) |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance of Common Stock, Net of Issuance Costs |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 5,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 1,000 |  |  |  |  | $ 1,000 |  |  |  |  |
Series C Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  | 11,000 |  |  | 11,000 |  | 11,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 1,000 |  |  |  |  | $ 1,000 |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  | 350 |  |  | 350 |  | 350 |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) |  |  |  | 38,889 |  |  |  |  | 38,889 |  |  |  |  |
Series D Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  | 4,200 |  |  | 4,200 |  | 4,200 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  | 4,200 |  | 0 |  |  | 0 |  | 0 |  |  |  |  |
Convertible Preferred Stock, Percent, Maximum Ownership (Rate) |  | 4.99% |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Percent, Maximum Ownership Upon Election (Rate) |  | 9.99% |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  | 1.41 |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Commitment Conversion Price (in dollars per share) |  |  |  |  |  | $ 2.50 |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Beneficial Conversion Feature |  |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |
Impact of Deemed Dividends |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |
Series D Convertible Preferred Stock [Member] | Hawk Search [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 618 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Embedded Beneficial Conversion Feature, Intrinsic Value | $ 724,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series D Convertible Preferred Stock [Member] | May 2021 Registered Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Series D Convertible Preferred Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) |  | 1,184,211 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 2,700 |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |

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