CREDIT FACILITY AND OTHER LOANS - Summary (FY) (Details) - Line of Credit - SAC Leasing G280 LLC Credit Facility - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Interest rate	12.50%	12.50%
Total unsecured convertible notes, gross	$ 33,750	$ 27,750	$ 4,500
Less unamortized debt discounts	(374)	(376)	(330)
Long-term debt, net	$ 33,376	$ 27,374	$ 4,170

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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