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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities      
Net (loss) profit $ (5,491,654) $ (3,142,255) $ 60,077
Adjustments for:      
Depreciation 4,981,259 4,979,274 5,246,912
Amortization of intangible assets 51,383 54,745 43,129
Interest income (8,728)
Stock-based compensation 100,936
Finance costs 909,093 650,492 515,846
Increase in deferred tax assets (732,868) (30,135) 55,545
Recovery of doubtful accounts, net (2,872) (19,554)
Increase in provision for withholding tax receivables 190,038 1,012,543
Write off of withholding tax receivables 710,219
Loss/(Gain) from fixed assets disposal 4,438 (431) (27,504)
Changes in operating assets and liabilities:      
(Increase)/Decrease in trade and other receivables (26,740) 389,320 858,205
(Increase)/Decrease in other current assets 236,234 123,764 122,371
(Increase)/Decrease in inventories (967,994) (484,745)
Decrease/(Increase) in amount due from related parties 352,432 (373,003) (12,930)
(Increase)/Decrease on other non-current assets (58,431) 162,998 (196,184)
(Decrease) in trade and other payables (437,086) (561,769) (446,040)
(Increase)/Decrease in other current liabilities 1,944,617 (670,072) (177,789)
Increase in income tax payables 272,972
(Decrease)/increase in amount due to related parties (361,815) 529,489 (381,737)
Decrease in withholding taxes receivable 88,353 799,606 (960,497)
Decrease in provision for employee benefits 297,905 386,425 321,489
Net cash inflows from operating activities 979,164 4,907,501 4,992,611
Cash flows from investing activities      
Payment for property, plant and equipment (5,235,480) (1,405,190) (433,513)
Proceeds from disposal of property, plant and equipment 29,164
Payment for intangible assets (13,235) (26,316) (47,163)
Cash acquired from acquisition of Handshake 24,276
Net cash (outflows) from investing activities (5,224,439) (1,431,506) (451,512)
Cash flows from financing activities      
Proceeds from issues of shares 13,244,329
Proceeds from borrowings 1,563,444 7,363,163 3,122,656
Repayment of borrowings (1,334,930) (5,371,766) (1,072,216)
Interest paid (926,203) (248,047) (260,179)
Lease payments (1,893,328) (2,876,314) (3,519,282)
Net cash inflows (outflows) from financing activities 10,653,312 (1,132,964) (1,729,021)
Effect of exchange rate changes on cash (684,136) 99,158 (585,922)
Net increase in cash and cash equivalents, and restricted cash 5,723,901 2,442,189 2,226,156
Cash and cash equivalents, and restricted cash at beginning of year 10,129,910 7,687,721 5,461,565
Cash and cash equivalents, and restricted cash at end of year 15,853,811 10,129,910 7,687,721
Non-cash investing and financing activities      
Leasehold improvements through finance leases $ 62,295