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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities: |  |  |
Net income | $ 4,457,097 | $ 4,000,499 | $ 3,001,489
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |
Write off against accounts receivable | 336,367 |  |
Depreciation and amortization expenses | 202,325 | 102,905 | 38,699
Amortization of right of use assets | 222,353 | 159,259 |
Recognition (reversal) of share-based compensation expenses | 168,350 | 159,984 | (14,483)
Deferred tax (benefits) expenses | (58,424) | (318,087) | 60,975
Equity investment loss | 25,622 |  |
Changes in fair value of short-term investments | 10,331 |  |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (5,486,914) | (3,134,065) | (792,031)
Prepayments | (197,402) | 231,894 | (583,613)
Other current assets | (1,143,200) | 119,523 | (659,145)
Accounts payable | 260,350 | 94,461 | (548,507)
Advances from customers | 6,398 | (476,261) | (125,872)
Income tax payable | 535,981 | 618,120 | 296,904
Accrued expenses and other liabilities | 179,738 | 408,725 | 85,954
Lease liabilities | (230,819) | (153,616) |
Deferred government grants | (325,992) | (405,321) | 552,277
Net Cash (Used in) Provided by Operating Activities | (1,037,839) | 1,408,020 | 1,312,647
Cash Flows from Investing Activities: |  |  |
Purchases of property and equipment | (160,602) | (1,312,941) | (668,067)
Payments of deposits for property purchase | (688,267) |  |
Payment for land use rights |  |  | (418,520)
Investments in short-term investments | (2,043,259) | (2,460,879) | (2,920,260)
Investment in a limited partnership | (1,217,039) |  |
Release from short-term investments |  | 3,618,940 | 3,502,799
Buy out of a non-controlling interests |  | (33,718) |
Loan repayment from (provided to) a related party | 14,489 | (14,476) |
Net Cash Used in Investing Activities | (4,094,678) | (203,074) | (504,048)
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of common stocks in connection with initial public offering, net of offering cost | 11,886,363 |  |
Payment of expenses relating to initial public offerings | (388,709) | (468,328) |
Capital contribution from shareholders |  |  | 3,580,260
Proceeds from bank borrowings |  |  | 756,544
Repayment of bank borrowings |  | (723,788) |
Net Cash Provided by (Used in) Financing Activities | 11,497,654 | (1,192,116) | 4,336,804
Effect of exchange rate changes on cash and cash equivalents | 875,258 | (98,953) | (205,243)
Net increase (decrease) in cash and cash equivalents | 7,240,395 | (86,123) | 4,940,160
Cash and cash equivalents at beginning of year | 7,832,552 | 7,918,675 | 2,978,515
Cash and cash equivalents at end of year | 15,072,947 | 7,832,552 | 7,918,675
Supplemental Cash Flow Information |  |  |
Cash paid for interest expense |  | 30,312 | 5,840
Cash paid for income tax | 2,642 | 87,111 | 144,252
Noncash investing activities |  |  |
Right of use assets obtained in exchange for operating lease obligations | $ 37,919 | $ 419,362 |

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