Note 14 - Stockholders Equity (Details Textual) $ / shares in Units, $ in Thousands | | | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended | | | |
Jul. 12, 2022 USD ($) $ / shares shares | Dec. 15, 2021 USD ($) $ / shares shares | Nov. 30, 2017 | Nov. 30, 2010 | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) $ / shares shares | Dec. 09, 2020 $ / shares | Jun. 16, 2020 USD ($) $ / shares shares | Oct. 04, 2019 shares |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | | | | $ 0.0001 | $ 0.0001 | | | $ 0.0001 | | $ 0.0001 | | $ 0.0001 | | |
Proceeds from Issuance of Common Stock | | | | | | | | | $ 415 | $ 0 | | | | | |
Stock Issued During Period, Value, New Issues | | | | | | $ 562 | $ 48 | | | | | | | | |
Proceeds from Issuance of Private Placement | | $ 16,740 | | | | | | | | | | | | | |
Adjustments to Additional Paid in Capital, Convertible Preferred Stock with Beneficial Conversion Feature | | 152 | | | | | | | | | | | | | |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares | | | | | 60,064,862 | 60,064,862 | | | 60,064,862 | | 40,931,857 | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments | | | | | | | | | $ 0 | | | | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value | | | | | | $ 0 | | $ 19 | $ 0 | $ 285 | | | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | | | | | | $ 0.58 | | $ 2.09 | $ 1.27 | $ 2.33 | | | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value | | | | | | $ 317 | | $ 380 | $ 1,197 | $ 1,180 | | | | | |
The 2010 Share Option Plan [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | | | 10 years | 7 years | | | | | | | | | | | |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares | | | | | 400,812 | 400,812 | | | 400,812 | | 212,650 | | | | |
The 2019 Plan [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares | | | | | | | | | | | | | | | 450,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares | | | | | 1,223,318 | 1,223,318 | | | 1,223,318 | | 376,414 | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Increase in Authorized Shares, Percentage of Outstanding Stock Maximum | | | | | | | | | 4% | | | | | | |
Common Stock [Member] | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | shares | | | | | | 1,185,529 | 400,000 | | | | | | | | |
Stock Issued During Period, Value, New Issues | | | | | | $ 0 | $ 0 | | | | | | | | |
Proceeds from Issuance of Private Placement | | $ 12,074 | | | | | | | | | | | | | |
Series A Preferred Stock [Member] | | | | | | | | | | | | | | | |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | | | | | | | | | | | $ 1.29 | | | | |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | $ 0.0001 | | | | | | | | | | | | | |
Proceeds from Issuance of Private Placement | | $ 4,514 | | | | | | | | | | | | | |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | shares | | | | | | | | | | | 3,790,755 | | | | |
Preferred Stock, Convertible, Conversion Ratio | | | | | | | | | | | 1 | | | | |
Preferred Stock, Maximum Conversion Cap Percentage | | | | | | | | | | | 9.99% | | | | |
Dividends Payable | | | | | | | | | | | $ 0 | | | | |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares | | | | | | | | | | | $ 1.25 | | | | |
Adjustments to Additional Paid in Capital, Convertible Preferred Stock with Beneficial Conversion Feature | | | | | | | | | | | $ 152 | | | | |
Equity Purchase Agreement [Member] | Lincoln Park [Member] | | | | | | | | | | | | | | | |
Equity Purchase Agreement, Maximum Offering Amount | | | | | | | | | | | | | | $ 31,000 | |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | | | | | | | | | | | | | $ 0.0001 | |
Equity Purchase Agreement, Maximum Shares Issuable (in shares) | shares | | | | | | | | | | | | | | 7,763,411 | |
Equity Agreement, Maximum Percentage of Stock Outstanding | | | | | | | | | | | | | | 19.99% | |
Equity Agreement, Minimum Average Purchase Price (in dollars per share) | $ / shares | | | | | | | | | | | | | | $ 3.9755 | |
Maximum Percentage of Outstanding Stock, Beneficial Ownership | | | | | | | | | | | | | | 9.99% | |
Stock Issued During Period, Shares, New Issues (in shares) | shares | | | | | | | | | 400,000 | | | 3,437,521 | | | |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | | | | | | | $ 2.70 | | | | | $ 2.70 | | | |
Stock Issued During Period, Shares, Commitment Fee (in shares) | shares | | | | | | | | | | | | 209,566,000 | | | |
Stock Issued During Period, Value, Commitment Fee | | | | | | | | | | | | $ 620 | | | |
Deferred Offering Costs | | | | | $ 0 | $ 0 | $ 123 | | $ 0 | | | $ 123 | | | |
Proceeds from Issuance of Common Stock | | | | | | | | | $ 272 | | | | | | |
LPC Purchase Agreement 2022 [Member] | Lincoln Park [Member] | | | | | | | | | | | | | | | |
Equity Purchase Agreement, Maximum Offering Amount | $ 11,000 | | | | | | | | | | | | | | |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.0001 | | | | | | | | | | | | | | |
Equity Purchase Agreement, Maximum Shares Issuable (in shares) | shares | 12,873,368 | | | | | | | | | | | | | | |
Equity Agreement, Maximum Percentage of Stock Outstanding | 19.99% | | | | | | | | | | | | | | |
Maximum Percentage of Outstanding Stock, Beneficial Ownership | 9.99% | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | shares | | | | | 500,000 | | | | | | | | | | |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | | | | | $ 0.50 | $ 0.50 | | | $ 0.50 | | | | | | |
Stock Issued During Period, Shares, Commitment Fee (in shares) | shares | 685,529 | | | | | | | | | | | | | | |
Stock Issued During Period, Value, Commitment Fee | $ 330 | | | | | | | | | | | | | | |
Stock Issued During Period, Value, New Issues | | | | | $ 251 | | | | | | | | | | |
The 2021 Private Placement [Member] | | | | | | | | | | | | | | | |
Proceeds from Issuance of Private Placement | | 16,999 | | | | | | | | | | | | | |
Payments of Stock Issuance Costs | | $ 259 | | | | | | | | | | | | | |
The 2021 Private Placement [Member] | Common Stock [Member] | | | | | | | | | | | | | | | |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | $ 0.0001 | | | | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | shares | | 9,808,418 | | | | | | | | | | | | | |
The 2021 Private Placement [Member] | Common Stock [Member] | | | | | | | | | | | | | | | |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | | | | | | | | | | $ 0.0001 | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | shares | | | | | | | | | | | 9,808,418 | | | | |
The 2021 Private Placement [Member] | Convertible Preferred Stock [Member] | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | shares | | | | | | | | | | | 3,790,755 | | | | |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | | | | | | | | | | $ 0.0001 | | | | |
Preferred Stock, Convertible, Shares Issuable (in shares) | shares | | | | | | | | | | | 3,790,755 | | | | |
The 2021 Private Placement [Member] | Series A Preferred Stock [Member] | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | shares | | 3,790,755 | | | | | | | | | | | | | |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | | $ 0.0001 | | | | | | | | | | | | | |