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Note 6 - Preferred Stock (Details Textual) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 28, 2022 shares | Dec. 31, 2023 $ / shares shares | Dec. 31, 2022 shares | Mar. 31, 2024 $ / shares shares | Jan. 25, 2022 $ / shares shares
Preferred Stock, Shares Authorized (in shares) |  |  |  | 3,000,000 |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.01 |
Conversion of Series B Preferred Stock into Common Stock [Member] |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  | 854,753 | 1,145,247 |  |
Conversion of Stock, Shares Issued (in shares) |  | 1,282,129 | 1,717,870 |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares) |  | 307,129 |  |  |
Series A Preferred Stock [Member] |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  | 2,445,598 |  | 2,445,598 |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.01 |  | $ 0.01 |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  | 0 |  | 0 |
Series A Preferred Stock [Member] | Maximum [Member] |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  | 3,000,000
Series B Preferred Stock [Member] |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  | 2,000,000 |  | 2,000,000 | 2,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.01 |  | $ 0.01 | $ 0.01
Preferred Stock, Convertible, Conversion Ratio |  |  |  |  | 1.5
Stock Issued During Period, Shares, New Issues (in shares) | 2,000,000 |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  | 650,000 | 854,753 | 0 |
Preferred Stock, Convertible, Shares Issuable (in shares) |  | 975,000 | 1,282,129 |  |

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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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