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REVOLVING LOAN AND PROMISSORY NOTE - RELATED PARTY (FY) (Tables) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 | Dec. 31, 2023
Debt Disclosure [Abstract] |  |
Summary of Revolving Loan and Promissory Note Outstanding | Revolving loan and promissory note with a related party consisted of the following at March 31, 2024 and December 31, 2023, in thousands:
| ​ | ​ | March 31, 2024 | ​ | ​ | December 31, 2023
Dennis Liotta, March 2023 – 10% interest – promissory note due March 2024 | ​ | ​ | $1,000 | ​ | ​ | $1,000
Total notes from related party - current | ​ | ​ | $1,000 | ​ | ​ | $1,000
| Revolving loan and promissory note with a related party consisted of the following at December 31, 2023 and December 31, 2022, in thousand:
| ​ | ​ | December 31, 2023 | ​ | ​ | December 31, 2022
Dennis Liotta, December 2021 – 4% interest – secured revolving loan, due January 2023 | ​ | ​ | $— | ​ | ​ | $5,150
Dennis Liotta, March 2023 – 10% interest – promissory note due March 2024 | ​ | ​ | 1,000 | ​ | ​ | —
Total notes from related party - current | ​ | ​ | $1,000 | ​ | ​ | $5,150

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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