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Summary of Significant Accounting Policies, Other Expenses, Net (FY) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |  |  |  |  |
Political contribution | $ 200,000 | $ 300,000 | $ 500,000 | $ 600,000 | $ 773,370 | $ 915,250 | $ 795,275
Financing fees |  |  |  |  | 807,474 | 3,540,636 | 286,228
Sales tax paid |  |  |  |  | 0 | 610,539 | 0
Gain (loss) from currency exchange |  |  |  |  | $ (729,505) | $ (34,705) | $ 7,455

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