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Note 9 - Sales of Shares Under Common Stock Purchase Agreement (Details Textual) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Oct. 18, 2023 | Jul. 08, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  | $ 0.001 | $ 0.001 |
Stock Issued During Period, Value, New Issues |  | $ 37,631 |  |  |
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) |  |  |  |  | $ 0.001
Common Stock, Maximum Shares Sold (in shares) |  |  |  |  | 450,000
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Registration Rights Agreement [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 0 | 7,429 |  |  |
Stock Issued During Period, Value, New Issues | $ 0 | $ 53,453 |  |  |
Shares Issued, Average Price Per Share (in dollars per share) |  | $ 7.2 |  |  |
Shares Issued, Fees Per Share (in dollars per share) |  | $ 0.4 |  |  |

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