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Discontinued operations - CW-Belize - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 31, 2019	Feb. 14, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Gain on sale of discontinued operations			$ 0	$ 0	$ 0	$ 3,621,170
CW Belize [Member]
Disposal Group, Including Discontinued Operation, Consideration		$ 7,000,000.0
Proceeds from Divestiture of Businesses	$ 265,000	6,735,000
Supplemental Deferred Purchase Price		$ 265,000
Gain on sale of discontinued operations						$ 3,621,170