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Cost of revenues and general and administrative expenses - Cost of revenues (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | $ 43,356,311 | $ 45,859,671
Electricity [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | 5,698,148 | 5,389,361
Depreciation [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | 5,855,073 | 6,202,012
Fuel oil [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | 5,742,056 | 4,157,393
Employee costs [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | 12,439,042 | 11,465,514
Maintenance [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | 2,092,776 | 2,859,262
Retail license royalties [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | 1,418,820 | 1,489,862
Insurance [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | 1,625,862 | 1,491,799
Materials [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | 1,952,764 | 5,786,698
Other [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
Cost of revenue | $ 6,531,770 | $ 7,017,770

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