Accounting policies - Additional Information (Details) gal in Millions			12 Months Ended
	Aug. 11, 2020 USD ($)	Jan. 24, 2020 USD ($)	Dec. 31, 2021 USD ($) gal	Dec. 31, 2020 USD ($)	Dec. 31, 2019
Foreign Currency Transaction Gain (Loss), before Tax [Abstract]
Interest Costs Capitalized			$ 0	$ 0
Foreign Currency Transaction Gain (Loss), before Tax			$ 32,594	68,818
Criteria for recognizing investment at cost			Investments where the Company does not exercise significant influence over the operating and financial policies of the investee and holds less than 20% of the voting stock are recorded at cost.
Equity Method Investment, Additional Information			The Company uses the equity method of accounting for investments in common stock where the Company holds 20% to 50% of the voting stock of the investee and has significant influence over its operating and financial policies but does not meet the criteria for consolidation.
Accumulated Amortization of Other Deferred Costs			$ 2,700,000	2,500,000
Amortization of Other Deferred Charges			$ 179,353	179,353
Amount required to reduce the amount of water lost by the public water distribution system | gal			438
Contracts in progress
Number of days after consumption billings are considered past due			45 days
Revenue			$ 66,863,502	$ 72,628,126
Aerex
Ownership interest held		100.00%
Cash		$ 8,500,000
PERC Water Corporation
Ownership interest held	61.00%
Cash	$ 900,000
Minimum [Member]
Contracts in progress
Number of days after consumption billings are collected			30 days
Maximum [Member]
Contracts in progress
Number of days after consumption billings are collected			45 days
Percentage Of Bad Debts				1.00%	1.00%
Bahamas [Member]
Contracts in progress
Revenue			$ 24,031,547	$ 21,654,153
Aerex
Ownership interest acquired		49.00%
PERC Water Corporation
Ownership interest acquired	10.00%
Retail [Member]
Contracts in progress
Revenue			22,104,953	22,952,370
Bulk [Member]
Contracts in progress
Revenue			26,800,869	24,312,546
Services [Member]
Contracts in progress
Revenue			13,884,857	12,937,859
Manufacturing Units [Member]
Contracts in progress
Revenue			4,072,823	12,425,351
Bulk revenue [Member]
Contracts in progress
Revenue			26,800,869	24,312,546
Capitalized Engineering Labor and Materials Cost [Member]
Foreign Currency Transaction Gain (Loss), before Tax [Abstract]
Other Assets			$ 3,500,000	$ 3,500,000