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INCOME TAX - Income tax benefit (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Federal:        
Current     $ 215,000 $ 128,000
State:        
Current     1,000 1,000
Valuation allowance     (3,200,000) (3,200,000)
Total provision for income taxes $ 59,000 $ 50,000 541,000 121,000
CONCORD ACQUISITION CORP III        
Federal:        
Current     1,385,741 995,207
Deferred     980,208 172,282
State:        
Current     0 0
Deferred     0 0
Valuation allowance     (980,208) (172,282)
Total provision for income taxes     $ 1,385,741 $ 995,207