Segment information (Details 2) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	$ 58,880,818	$ 49,683,771
Cayman Island [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	24,340,063	23,182,334
Bahamas [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	32,738,531	24,511,285
United States [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	1,609,637	1,847,524
Other [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	$ 192,587	$ 142,628