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Note 10 - Sales of Shares Under Common Stock Purchase Agreement (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 10, 2022 | Aug. 11, 2022 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | 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 |  |  |  |  |
Registration Rights Agreement [Member] |  |  |  |  |  |  |  |  |
Common Stock, Maximum Shares Sold (in shares) |  |  |  |  |  |  |  |  | 4,500,000
Common Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 0 |  |  |  |  |  |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.001
Amortization of Commitment Fee |  |  | $ 76,673 |  |  | $ 92,495 |  |  |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |  |
Commitment Fee, Fair Value Disclosure |  |  |  |  |  |  |  | $ 150,000 |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Commitment Fee [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 29,945 | 89,835 |  |  |  |  |  |  |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Common Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 74,286 |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 0.72 |  |  | $ 0.72 |  |  |
Shares Issued, Fees Per Share (in dollars per share) |  |  | $ 0.04 |  |  | $ 0.04 |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  | $ 0 | $ 53,453 | $ 0 |  |

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