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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