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Discontinued operations - Mexico project development- Narratives (Details) $ / shares in Units, gal in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 28, 2020 USD ($) | Aug. 28, 2020 MXN ($) | Jun. 29, 2020 | Aug. 22, 2016 | Sep. 30, 2021 MXN ($) | Aug. 22, 2016 gal | Nov. 30, 2015 gal | Feb. 28, 2014 USD ($) | May 31, 2013 USD ($) $ / shares | Feb. 29, 2012 USD ($) | May 31, 2010 gal | Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) ha | Dec. 31, 2019 | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss on long-lived assets |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |  |
Adjustment to reduce operating lease right of use assets |  |  |  |  |  |  |  |  |  |  |  | 2,600,000 | $ 2,600,000 |  |  |  |
Adjustment to reduce operating lease liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000 | 2,200,000 |  |  |  |
Payments For Option Exercised |  |  |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  |  |  | $ 1 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Total Voting Interest Percentage After Conversion Of Loan |  |  |  |  |  |  |  |  |  |  | 99.99% |  |  |  |  |  |
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 land and rights of way held for development |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |
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 | 50 |  |  |  |  |  |  |  |  |  |
NSC Agua [Member] | Second Phase [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seawater Reverse Osmosis Desalination Plant Per Day Processing Capacity | gal |  |  |  |  |  | 50 | 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 |  |  |  |  |  |  |

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