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Note 9 - Sales of Shares Under Common Stock Purchase Agreement (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Jul. 08, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001 |
Stock Issued During Period, Value, New Issues |  |  | $ 56,266 |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 0 | $ 56,266 |  |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] |  |  |  |  |  |  |
Purchase Agreement, Maximum Amount to be Sold |  |  |  |  |  |  | $ 15,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  | $ 0.0001
Common Stock, Maximum Shares Sold (in shares) |  |  |  |  |  |  | 150,000
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Registration Rights Agreement [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 0 |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 0 |  | $ 0 | $ 2,479 |  |
Shares Issued, Average Price Per Share (in dollars per share) |  |  |  |  | $ 21.56 |  |
Shares Issued, Fees Per Share (in dollars per share) |  | $ 1.2 |  |  | $ 1.2 |  |
Proceeds from Issuance of Common Stock |  |  |  |  | $ 53,453 |  |

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