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INTANGIBLES (FY) (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Schedule of Finite-Lived Intangible Assets | The following is a summary of finite-lived intangible assets as of March 31, 2024 and December 31, 2023, in thousands:
| ​ | ​ | March 31, 2024
| ​ | ​ | Cost | ​ | ​ | Accumulated Amortization | ​ | ​ | Net
Customer relationships | ​ | ​ | $301 | ​ | ​ | $(125) | ​ | ​ | $176
| ​ | ​ | $301 | ​ | ​ | $(125) | ​ | ​ | $176
| ​ | ​ | December 31, 2023
| ​ | ​ | Cost | ​ | ​ | Accumulated Amortization | ​ | ​ | Net
Customer relationships | ​ | ​ | $301 | ​ | ​ | $(110) | ​ | ​ | $191
| ​ | ​ | $301 | ​ | ​ | $(110) | ​ | ​ | $191
| The following is a summary of finite-lived intangible assets as of December 31, 2023 and 2022, in thousand:
| ​ | ​ | December 31, 2023
| ​ | ​ | Cost | ​ | ​ | Accumulated Amortization | ​ | ​ | Net
Customer relationships | ​ | ​ | $301 | ​ | ​ | $(110) | ​ | ​ | $191
| ​ | ​ | $301 | ​ | ​ | $(110) | ​ | ​ | $191
| ​ | ​ | December 31, 2022
| ​ | ​ | Cost | ​ | ​ | Accumulated Amortization | ​ | ​ | Net
Customer relationships | ​ | ​ | $301 | ​ | ​ | $(49) | ​ | ​ | $252
| ​ | ​ | $301 | ​ | ​ | $(49) | ​ | ​ | $252
Schedule of Finite-Lived Intangible Assets Amortization Expense | As of March 31, 2024, future amortization expense is expected to be as follows, in thousands:
| ​ | ​ | Amount
2024 | ​ | ​ | $45
2025 | ​ | ​ | 60
2026 | ​ | ​ | 60
2027 | ​ | ​ | 11
| ​ | ​ | $176
| As of December 31, 2023, future amortization expense is expected to be as follows, in thousand:
Fiscal years ending December 31, | ​ | ​ | Amount
2024 | ​ | ​ | $60
2025 | ​ | ​ | 60
2026 | ​ | ​ | 60
2027 | ​ | ​ | 11
| ​ | ​ | $191
Schedule of Indefinite-Lived Intangible Assets | The following table summarizes the balances as of March 31, 2024 and December 31, 2023, of the indefinite-lived intangible assets, in thousands:
| ​ | ​ | March 31, 2024 | ​ | ​ | December 31, 2023
Intangible asset - Part 135 certificate | ​ | ​ | $1,200 | ​ | ​ | $1,200
| The following table summarizes the balances as of December 31, 2023 and 2022, of the indefinite-lived intangible assets, in thousand:
| ​ | ​ | December 31, 2023 | ​ | ​ | December 31, 2022
Intangible asset – Part 135 certificate | ​ | ​ | $1,200 | ​ | ​ | $1,363

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