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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Operating activities        
Net (loss) profit $ (233,938) $ 471,481 $ 176,029 $ 1,150,574
Adjustments to reconcile to net profit to net cash used in operating activities        
Depreciation 2,769,881 1,241,734 2,446,734 2,248,992
Amortization of intangible assets 20,164 21,105 39,061 39,179
Interest income     (71,870) (20,924)
Interest received     65,922 20,924
Interest expense 188,183 770,230 621,971
Interest paid     (350,938) (240,350)
Deferred tax 27,866 288,646 119,953 173,060
Administration expenses - assumed     575,923
Bad debt expense 20,455 38,160 20,901 380
Loss (gain) on fixed asset disposal     59,174 (10,408)
Changes in operating assets and liabilities:        
Accounts and other receivables, net 691,525 (291,996) (106,724) (704,819)
Other current assets 84,710 (948,857) (24,823) 166,681
Other non-current assets (15,740) (749,176) 6,269 (19,549)
Trade and other payables (283,198) 618,416 1,938,770 (262,808)
Other current liabilities (144,579) 531,060 301,769 (190,791)
Withholding tax receivable (467,415) (446,021) (902,796) (829,383)
Provision for employee benefits 184,625 181,428 371,834 1,006,330
Net cash provided by operating activities 2,842,539 955,980 5,435,418 3,149,059
Investing activities        
Purchase of property and equipment (1,110,315) (996,502) (1,844,177) (1,666,032)
Proceeds from disposal of property and equipment 1,911 925 19,537 29,706
Purchase of intangible assets (22,000) 52,233 (101,446) (98,311)
Loans to related parties (224,106) (293,404)
Net cash (used in) investing activities (1,130,404) (1,167,450) (2,219,490) (1,734,637)
Financing activities        
Proceeds from borrowings 12,936,058 956,554 1,282,283
Repayment of borrowings (1,127,666) (12,731,364) (811,535)
Lease payments (1,832,356) (328,439)    
Principal finance lease payments     (1,454,992) (1,613,380)
Capital distribution     (1,000,000) (4,004,574)
Net cash (used in) provided by financing activities (2,960,022) (123,745) (2,309,973) (4,335,671)
Effect of exchange rate changes on cash 59,088 77,837 317,172 (853,008)
Net increase (decrease) in cash and cash equivalents, and restricted cash (1,188,799) (257,378) 1,223,127 (3,774,257)
Cash and cash equivalents, and restricted cash at beginning of year 5,461,565 4,238,438 4,238,438 8,012,695
Cash and cash equivalents, and restricted cash at end of year 4,272,766 3,981,060 5,461,565 4,238,438
Leasehold improvements through finance leases     1,356,884 1,239,203
Related party loan replaced by third party loan     $ 13,056,120
Increase of lease liability and right of use assets $ 6,121,542