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Cost of revenues and general and administrative expenses - General and administrative expenses (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] |  |
General and Administrative Expense | $ 18,350,359 | $ 18,434,898
Employee costs [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 9,562,125 | 10,086,588
Insurance [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 1,813,026 | 1,436,957
Professional fees [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 1,506,423 | 1,488,948
Directors' fees and expenses [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 851,775 | 865,555
Depreciation [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 140,140 | 133,477
Amortization of intangibles [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 746,667 | 891,667
Other [Member]. |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | $ 3,730,203 | $ 3,531,706

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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