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Note 13 - Subsequent Events (Details Textual) - $ / shares | Nov. 10, 2023 | Sep. 30, 2023 | Jan. 23, 2012
--- | --- | --- | ---
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 19
Common Stock [Member] |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 5.97 |
Common Stock [Member] | Subsequent Event [Member] |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 1.24 |  |
Warrant [Member] |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 0.045 |
Warrant [Member] | Subsequent Event [Member] |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 0.0202 |  |

X
- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |