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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities      
Net (loss) income $ (8,736,566) $ 11,319,952 $ 7,558,222
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 533,949 446,878 410,079
Loss from disposal of fixed assets 983 1,559
Allowance for doubtful accounts 419,353 (230,175) 98,102
Inventory reserve 15,774 (75,391)
Deferred income tax benefit (605,278) (668,341) (9,886)
Short-term investments income 470,477 (239,549)
Changes in operating assets and liabilities:      
Accounts receivable (1,549,312) (3,867,457) (4,107,520)
Inventory, net 16,586 (451,634) 888,607
Advance to suppliers, net 2,681,214 (2,717,085)
Prepayment for advertising 7,385,695 (7,434,240)
Advances to related parties 236,982 (237,720)
Prepaid expenses and other current assets (1,699,929) (168,188) 12,407
Accounts payable (1,896,621) 2,457,337 639,427
Taxes payable (904,127) (298,620) 731,518
Accrued expenses and other current liabilities 2,318,474 31,436 (30,408)
Net cash (used in) provided by operating activities (1,312,346) (2,055,847) 6,115,157
Cash flows from investing activities      
Purchases of property and equipment (93,703) (444,505) (51,798)
Proceeds from disposal of fixed assets 523
Prepayments made to a related party for purchase of property (2,457,600)
Prepayments for construction in progress (10,629,120)
Prepayment for acquisition (3,814,925)
Payments for short-term investments (15,330,660)
Redemption of short-term investments 1,801,927
Net cash used in investing activities (3,908,105) (27,059,958) (51,798)
Cash flows from financing activities      
Proceeds from short-term bank loans 4,272,716 4,300,800 1,427,000
Repayment of bank loans (4,272,716) (2,764,800) (1,427,000)
Dividend payment
Gross proceeds from initial public offerings 28,750,000
Payment for deferred initial public offering costs (2,792,543) (441,064)
Proceeds from (prepayments for) related parties borrowings 3,317,943 (911,648) 911,200
Net cash provided by financing activities 3,317,943 26,581,809 470,136
Effect of exchange rate changes on cash (463,942) 553,702 347,386
Net (decrease) increase in cash (2,366,450) (1,980,294) 6,880,881
Cash, beginning of year 8,077,908 10,058,202 3,177,321
Cash, end of year 5,711,458 8,077,908 10,058,202
Supplemental disclosure information      
Cash paid for interest expense 199,852 149,303 157,528
Cash paid for income tax $ 2,748,629 $ 3,271,219 $ 2,167,963