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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Asset and Liabilities Measured at Fair Value (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments, equity securities $ 1,137,000 $ 888,000 $ 1,143,000
Total assets at fair value 1,137,000 888,000 1,619,000
Interest Rate Swap      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate swap     476,000
Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments, equity securities 1,137,000 888,000 1,143,000
Total assets at fair value 1,137,000 888,000 1,143,000
Level 1 | Interest Rate Swap      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate swap     0
Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments, equity securities 0 0 0
Total assets at fair value 0 0 476,000
Level 2 | Interest Rate Swap      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate swap     476,000
Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments, equity securities 0 0 0
Total assets at fair value $ 0 $ 0 0
Level 3 | Interest Rate Swap      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate swap     $ 0