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Segment information - Property, plant and equipment, net by major geographic region (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Segment information    
Property, plant and equipment, net $ 52,432,282 $ 55,882,521
Cayman Islands    
Segment information    
Property, plant and equipment, net 31,882,111 32,902,949
Bahamas    
Segment information    
Property, plant and equipment, net 17,903,191 20,039,049
United States [Member]    
Segment information    
Property, plant and equipment, net $ 2,646,980 $ 2,940,523