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RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS, Cash Flow Statement (FY) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2020
Cash Flow Statement [Abstract] |  |  |  |
Net income (loss) | $ 1,517,138 | $ (429,155) | $ (429,155) | $ (8,247,187)
Change in fair value of warrant liability | (5,068,000) | (181,000) |  | 7,240,000
Transaction costs allocated to warrant liability |  | 580,000 | 580,000 | 580,000
Net cash used in operating activities | $ (443,769) | (24,003) |  | (455,960)
As Previously Reported [Member] |  |  |  |
Cash Flow Statement [Abstract] |  |  |  |
Net income (loss) |  | (30,155) | (30,155) | (427,187)
Change in fair value of warrant liability |  | 0 |  | 0
Transaction costs allocated to warrant liability |  | 0 | 0 | 0
Net cash used in operating activities |  | (24,003) |  | (455,960)
Accounting For Warrants [Member] | Adjustments [Member] |  |  |  |
Cash Flow Statement [Abstract] |  |  |  |
Net income (loss) |  | (399,000) | (399,000) | (7,820,000)
Change in fair value of warrant liability |  | (181,000) |  | 7,240,000
Transaction costs allocated to warrant liability |  | 580,000 | $ 580,000 | 580,000
Net cash used in operating activities |  | $ 0 |  | $ 0

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