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Income Taxes - Provision for income taxes (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Current        
Federal     $ 215,000 $ 128,000
State     1,000 1,000
Foreign     325,000 (8,000)
Total current     541,000 121,000
Deferred        
Total provision for income taxes $ 59,000 $ 50,000 $ 541,000 $ 121,000