SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES, Liquidity and Going Concern (FY) (Details) - USD ($) |
3 Months Ended | 12 Months Ended | 35 Months Ended | ||
|---|---|---|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2023 |
|
| Liquidity and Going Concern [Abstract] | |||||
| Cash from operations | $ (9,316,000) | $ (3,774,500) | $ (9,733,500) | $ (24,201,500) | $ 37,732,000 |
| Proceeds from issuance of convertible promissory notes | $ 47,455,000 | $ 0 | 3,500,000 | $ 15,360,000 | 40,460,000 |
| Net cash proceeds from business combination | 273,017,500 | 273,017,500 | |||
| Cash [Member] | |||||
| Liquidity and Going Concern [Abstract] | |||||
| Net cash proceeds from business combination | 233,017,500 | 233,017,500 | |||
| Restricted Cash [Member] | |||||
| Liquidity and Going Concern [Abstract] | |||||
| Net cash proceeds from business combination | $ 40,000,000 | $ 40,000,000 | |||