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Other long-term liabilities, Summary (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Other long-term liabilities [Abstract] |  |  |
Accrued provision for warranties | [1] | $ 840,024 | $ 0
Greek state loan | [2] | 137,805 | 42,793
Jubilee provision |  | 17,805 | 0
Other long-term liabilities |  | $ 995,634 | $ 42,793
[1] | As of December 31, 2021, the amount of $840,024 relates to the non-current portion of a total accrued warranty reserve of $1,048,281, recognized on fuel cells sold, as discussed in Note 2.
[2] | Under a decision published by the Greek government a state aid was provided to various entities affected by COVID-19. In this context, the Company applied for and received an aggregate amount of $152,757 during 2021 and 2020, which is repayable from June 2022 through September 2025 and bears an interest rate ranging from 0.74% to 0.94%. As of December 31, 2021, the current portion of this loan amounts to $14,952 and is included in other short- term payables (Note 12) within “Other current liabilities” on the consolidated balance sheets.

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14394-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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