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Accounting policies - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	Jan. 24, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2020
Foreign Currency Transaction Gain (Loss), before Tax [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax		$ 180,985	$ 57,701
Contracts in progress
Number of days after consumption billings are considered past due		45 days
Unsatisfied or partially unsatisfied performance obligations for contracts in progress		$ 3,200,000
Revenue expected to earn as it satisfies its performance obligations during the remainder of the year ending December 31, 2020					$ 1,900,000
Revenue expected to earn as it satisfies its performance obligations after year ending December 31, 2020					$ 1,300,000
Aerex
Contracts in progress
Ownership interest acquired	49.00%
Cash	$ 8,500,000
Ownership interest held	100.00%
Minimum [Member]
Contracts in progress
Number of days after consumption billings are collected		30 days
Maximum [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Percentage Of Bad Debts		1.00%		1.00%
Contracts in progress
Number of days after consumption billings are collected		35 days
Bahamas [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Deposits held in foreign bank		$ 9,800,000
Certificates of Deposit [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash Equivalents, at Carrying Value		$ 9,000,000		$ 12,700,000

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