Segment information - Revenues earned by major geographic region and major customer (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 66,863,502	$ 72,628,126
Cayman Islands [Member]
Segment Reporting Information [Line Items]
Revenue	24,935,746	25,640,169
Bahamas [Member]
Segment Reporting Information [Line Items]
Revenue	24,031,547	21,654,153
United States [Member]
Segment Reporting Information [Line Items]
Revenue	17,489,851	24,918,527
Management Services Agreement With OC-BVI [Membre]
Segment Reporting Information [Line Items]
Revenue	406,358	415,277
Water and Sewerage Corporation [Member]
Segment Reporting Information [Line Items]
Revenue	$ 24,031,547	$ 21,527,487
Percentage of consolidated revenues	36.00%	30.00%
One Customer [Member]
Segment Reporting Information [Line Items]
Revenue	$ 406,073	$ 9,965,041
Percentage of consolidated revenues	1.00%	14.00%