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CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 9,073,954 | $ 7,919,408 | $ 5,124,973
Adjustments to reconcile net income to net cash used in operating activities: |  |  |
Depreciation of property, plant and equipment | 100,474 | 101,183 | 14,702
Amortization of intangible assets | 821,203 | 362,355 | 193,255
Provision for doubtful accounts | 921,904 | 495,528 | 93,348
Deferred income taxes | (48,710) | (107,401) | (14,431)
Loss on disposal of equipment |  | 771 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (2,772,546) | (6,588,070) | (2,299,311)
Other receivables | (642,904) | (28,615) | (73,345)
Other receivables - related party | 12,008 | (12,506) |
Inventories | 145,890 | 304,072 | 346,821
Prepayments | 1,044,280 | 829,573 | (385,782)
Prepaid expense | (13,580) | 50,233 | (71,639)
Accounts payable | (1,102,260) | (4,151,400) | 3,122,321
Other payables and accrued liabilities | 3,215,946 | 161,038 | (39,412)
Customer deposits | (76,098) | (29,714) | 19,221
Taxes payable | 1,629,685 | 278,941 | 958,959
Net cash (used in) generated from operating activities | 12,309,246 | (414,604) | 6,989,680
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Deposits for business acquisitions | (12,470,811) |  |
Purchases of property and equipment | (2,218,838) | (44,905) | (53,737)
Proceeds from disposal of equipment |  | 76 |
Prepayments for intangible assets | (1,018,127) | (3,574,784) |
Purchase of intangible assets | (3,404,004) | (859,841) | (1,967,360)
Proceeds from short-term investments |  | 19,485,793 | 3,574,969
Purchase of short-term investments |  | (2,391,721) | (17,361,393)
Payments on long-term investments |  | (1,812,632) | (7,399)
Net cash (used in) generated from investing activities | (19,111,780) | 10,801,986 | (15,814,920)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Capital injection |  |  | 8,772,355
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 |  |
Prepaid initial public offering costs |  | (92,854) |
Other payables - related party | (40,634) | 31,721 | 26,192
Repayments of short-term loans - banks | (3,118,473) | (3,549,737) | (2,108,665)
Short-term loans - banks | 5,888,837 | 3,247,632 | 3,477,448
Repayments of long-term loans - third party | (75,170) | (62,983) |
Net cash generated from (used in) financing activities | 10,596,581 | (426,221) | 10,167,330
Effect of exchange rates 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 | 10,478,587 | 11,829,509 | 2,370,283
Restricted cash | 5,000,000 |  |
Cash and cash equivalents, end of year | 15,478,587 | 11,829,509 | 2,370,283
Provision for doubtful trade receivables | 842,179 | 474,087 | 75,398
Provision for doubtful other receivables | 13,680 | 17,131 | 3,858
Provision for doubtful prepayments | 66,045 | 4,310 | 14,092
Provision for doubtful accounts | 921,904 | 495,528 | 93,348
Cash paid for income tax | 119,243 | 1,713,763 |
Cash paid for interest | 171,938 | 142,641 | 183,291
Supplemental non-cash investing information: |  |  |
Additional operating lease, right-of-use asset | 679,850 |  |
Equipment acquired through long-term loans – third party |  |  | 198,756
Supplemental non-cash FINANCING information: |  |  |
Operating lease liabilities | $ 685,511 |  |

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