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Accounting policies - Disaggregated revenue (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Total Revenue | $ 72,628,126 | $ 68,793,651
Contracts in progress |  |
Number of days after consumption billings are considered past due | 45 days |
Bahamas [Member] |  |
Total Revenue | $ 21,654,153 | $ 23,114,860
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 | 35 days |
Percentage Of Bad Debts | 1.00% | 1.00%
Retail revenue [Member] |  |
Total Revenue | $ 22,952,370 | $ 26,456,022
Bulk revenue [Member] |  |
Total Revenue | 24,312,546 | 26,986,108
Services revenue [Member] |  |
Total Revenue | 12,937,859 | 1,759,446
Manufacturing revenue [Member] |  |
Total Revenue | $ 12,425,351 | $ 13,592,075

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