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Significant Accounting Policies, Cash and Cash Equivalents (FY) (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Abstract]      
Cash $ 213,335 $ 1,426,006 $ 1,393,939
Cash and cash equivalents $ 0 $ 0 $ 0