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Concentrations and Credit Risk (Details 1) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable | $ 16,816,885 | $ 21,751,032
Customer A [Member] |  |
Accounts receivable | $ 2,611,583 | $ 1,769,416
Concentration risk, percentage of accounts receivable | 15.83% | 11.49%
Customer H [Member] |  |
Accounts receivable | $ 4,389,574 | $ 4,283,023
Concentration risk, percentage of accounts receivable | 26.61% | 27.82%
Customer I [Member] |  |
Accounts receivable | $ 2,350,307 | $ 2,293,257
Concentration risk, percentage of accounts receivable | 14.25% | 14.89%

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