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Accounting policies - Disaggregated revenue (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Total Revenue | $ 17,103,317 | $ 20,725,721 |
Contracts in progress |  |  |
Percentage Of Bad Debts | 1.00% |  | 1.00%
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 |  |
Retail revenue [Member] |  |  |
Total Revenue | $ 5,711,305 | 7,257,432 |
Bulk revenue [Member] |  |  |
Total Revenue | 6,245,970 | 6,440,284 |
Services revenue [Member] |  |  |
Total Revenue | 3,540,846 | 3,114,813 |
Manufacturing revenue [Member] |  |  |
Total Revenue | $ 1,605,196 | $ 3,913,192 |

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