Cash and cash equivalents (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Bank accounts	$ 32,619,843	$ 34,518,257
Short term deposits	7,738,216	9,275,893
Cash and cash equivalents at end of period	40,358,059	43,794,150
United States dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	15,888,445	14,001,264
Short term deposits	5,324,258	5,796,582
Cayman Islands dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	12,784,358	5,650,874
Short term deposits	2,413,958	2,413,547
Bahamian dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	3,944,208	14,863,287
Short term deposits	0	1,065,764
Bermudian dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	$ 2,832	$ 2,832