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CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Details 2) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net income | $ 9,073,954 | $ 7,919,408 | $ 5,124,973
Changes in operating assets and liabilities: |  |  |
Other receivables | 642,904 | 28,615 | 73,345
Other payables and accrued liabilities | 3,215,946 | 161,038 | (39,412)
Net cash used in operating activities | 12,309,246 | (414,604) | 6,989,680
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | 2,218,838 | 44,905 | 53,737
Net cash used in investing activities | (19,111,780) | 10,801,986 | (15,814,920)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from initial public offering, net of issuance costs | 7,417,077 |  |
Underwriter’s partial exercise of over-allotment option, net of issuance costs | 524,944 |  |
Other payables - related party | (40,634) | 31,721 | 26,192
Net cash used in investing activities | 10,596,581 | (426,221) | 10,167,330
EFFECT OF EXCHANGE RATE ON CASH | (144,969) | (501,935) | 72,267
NET CHANGES IN CASH AND CASH EQUIVALENTS | 3,649,078 | 9,459,226 | 1,414,357
Cash and cash equivalents, beginning of year | 11,829,509 | 2,370,283 | 955,926
Cash and cash equivalents, end of year | 15,478,587 | 11,829,509 | 2,370,283
Supplemental cash flow information: |  |  |
Cash and cash equivalents | 11,829,509 | 2,370,283 |
Restricted cash | 5,000,000 |  |
Parent Company |  |  |
Net income | 9,073,954 | 7,919,408 | 5,124,973
Adjustments to reconcile net income to cash used in operating activities: |  |  |
Equity income of subsidiaries and VIEs | (10,747,395) | (7,919,408) | (5,124,973)
Changes in operating assets and liabilities: |  |  |
Other receivables | (600,000) |  |
Other payables and accrued liabilities | 1,570,183 |  |
Net cash used in operating activities | (703,258) |  |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (2,162,449) |  |
Net cash used in investing activities | (2,162,449) |  |
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from initial public offering, net of issuance costs | 7,417,077 |  |
Underwriter’s partial exercise of over-allotment option, net of issuance costs | 524,944 |  |
Other payables - related party | 269 |  |
Net cash used in investing activities | 7,942,290 |  |
EFFECT OF EXCHANGE RATE ON CASH |  |  |
NET CHANGES IN CASH AND CASH EQUIVALENTS | 5,076,583 |  |
Cash and cash equivalents, beginning of year |  |  |
Cash and cash equivalents, end of year | 5,076,583 |  |
Supplemental cash flow information: |  |  |
Cash and cash equivalents |  |  |
Restricted cash | 5,000,000 |  |
Cash and cash equivalents, end of year | $ 5,076,583 |  |

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