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Concentrations and Credit Risk (Details 1) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable | $ 7,952,420 | $ 21,751,032
Customer A [Member] |  |
Accounts receivable | $ 1,725,293 | $ 1,769,416
Concentration risk, percentage of accounts receivable | 21.93% | 11.49%
Customer B [Member] |  |
Accounts receivable |  | $ 4,283,023
Concentration risk, percentage of accounts receivable |  | 27.82%
Customer C [Member] |  |
Accounts receivable |  | $ 2,293,257
Concentration risk, percentage of accounts receivable |  | 14.89%
Customer D [Member] |  |
Accounts receivable | $ 1,713,628 |
Concentration risk, percentage of accounts receivable | 21.78% |
Customer E [Member] |  |
Accounts receivable | $ 902,309 |
Concentration risk, percentage of accounts receivable | 11.47% |
Customer F [Member] |  |
Accounts receivable | $ 830,821 |
Concentration risk, percentage of accounts receivable | 10.56% |

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