Discontinued operations - Mexico project development- Narratives (Details) $ / shares in Units, gal in Millions								1 Months Ended					12 Months Ended
	Feb. 09, 2022 USD ($)	Feb. 09, 2022 MXN ($)	Oct. 01, 2020 MXN ($)	Aug. 28, 2020 USD ($)	Aug. 28, 2020 MXN ($)	Jun. 29, 2020	Aug. 22, 2016	Aug. 22, 2016 gal	Feb. 28, 2014 USD ($)	May 31, 2013 USD ($) $ / shares	Feb. 29, 2012 USD ($)	May 31, 2010 gal	Dec. 31, 2020 USD ($)	Mar. 31, 2022 USD ($) ha	Feb. 28, 2018	Jan. 31, 2018
Schedule of Investments [Line Items]
Land														$ 21,100,000
Period Required To Operate And Maintain Plant And Aqueduct							37 years
Number of days to submit list of non-recoverable expenses made						20 days
Amount of non-recoverable expenses				$ 51,144,525	$ 137,333,114
Litigation Settlement, Expense		$ 137,000,000
Payments For Option Exercised									$ 1,000,000.0
Share Price | $ / shares										$ 1
Minimum [Member]
Schedule of Investments [Line Items]
Loss Contingency, Damages Sought, Value	$ 51,000,000
Discontinued Operations. | Mexico Project Development
Schedule of Investments [Line Items]
Impairment loss for Mexico assets - discontinued operations													$ 3,000,000.0
Aguas de Rosarito S.A.P.I. de C.V [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage														50.00%
Option agreement [Member]
Schedule of Investments [Line Items]
Payments To Enter Option Agreement											$ 300,000
NSC Agua [Member]
Schedule of Investments [Line Items]
Total Percentage Of Ownership Interest In An Acquired Company																99.99%
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal								100				100
Area of Land | ha														20.1
Equity Method Investment, Ownership Percentage														50.00%
Period in which construction must be completed							36 months
Payments For Option Exercised									$ 1,000,000.0
Percentage of Voting Interest Acquired through Option Agreement									25.00%	25.00%
Guarantee amount required for suspension			$ 50,000
NSC Agua [Member] | Aguas de Rosarito S.A.P.I. de C.V [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage													99.60%		0.40%
NSC Agua [Member] | First Phase [Member]
Schedule of Investments [Line Items]
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal								50
NSC Agua [Member] | Second Phase [Member]
Schedule of Investments [Line Items]
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal								50
NSC Agua [Member] | Option agreement [Member]
Schedule of Investments [Line Items]
Total Voting Interest Percentage After Conversion Of Loan										99.99%
Repayment of inter-company loan payable										$ 5,700,000
Option Agreement Expiration Date											Feb. 07, 2014