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Note 10 - Sales of Shares Under Common Stock Purchase Agreement (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 02, 2023 | Nov. 10, 2022 | Aug. 11, 2022 | Jul. 08, 2022 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001 | $ 0.001
Stock Issued During Period, Value, New Issues |  |  |  |  | $ 290,842 | $ 56,266 | $ 1,999,500 |  |  | $ 2,037,000 |
Registration Rights Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Maximum Shares Sold (in shares) |  |  |  | 450,000 |  |  |  |  |  |  |
Common Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 20,000 |  |  |  |  |  |  |  |  |  |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 0.001 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  |  | 0 |
Amortization of Commitment Fee |  |  |  |  | $ 54,692 |  |  | $ 150,000 |  |  |
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] | Registration Rights Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 119,780 |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 150,000 |  |  |  |  |  |  |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Commitment Fee [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 2,995 | 8,984 |  |  |  |  |  |  |  |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Common Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 20,000 |  | 0 | 27,429 |  |  |
Shares Issued, Average Price Per Share (in dollars per share) |  |  |  |  | $ 5.9 |  |  | $ 6.3 |  |  |
Shares Issued, Fees Per Share (in dollars per share) |  |  |  |  | $ 0.3 |  |  | $ 0.3 |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  | $ 118,655 |  |  | $ 172,108 | $ 0 |  |

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