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Note 11 - Changes in Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 30, 2023 | Jun. 01, 2023 | Jul. 07, 2021 | Feb. 05, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Preferred Stock, Shares Authorized (in shares) |  |  |  |  | 20,000,000 |  | 20,000,000 | 20,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001
Preferred Stock, Shares Issued (in shares) |  |  |  |  | 0 |  | 0 | 0
Common Stock, Shares Authorized (in shares) |  |  |  |  | 500,000,000 |  | 500,000,000 | 500,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001
Common Stock, Shares, Issued (in shares) |  |  |  |  | 5,603,083 |  | 4,847,384 | 4,809,070
Proceeds from Issuance of Common Stock |  |  |  |  | $ 3,675,000 | $ 0 | $ 0 | $ 5,562,511
Private Placement [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 3,675,000 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 735,000 |  | 714,701 | 631,250 |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 5 |  |  |  |  |  |  |
Five Nonemployee Directors [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  | 20,699 |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services |  | $ 125,229 |  |  |  |  |  |

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