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FIXED ASSETS - Narrative (FY) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Abstract]        
Depreciation $ 65 $ 30 $ 140 $ 112