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Note 9 - Grant Revenue (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0 $ 0 $ 81,526 $ 81,526 $ 385,501
NIH Grants [Member]            
Revenue from Contract with Customer, Including Assessed Tax         $ 81,526 $ 385,501