Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 1,934,666	$ 813,853
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	404,526	412,054
Stock-based compensation expenses	517	42,151
Bad debt expense		18,043
Amortization of operating lease right-of-use assets	172,891	131,088
Changes in operating assets:
Accounts receivable	(7,548,486)	(10,531,884)
Inventories	(6,264,474)	4,556,693
Prepaid expenses and other current assets	(126,087)	504,484
Advance to suppliers	2,925,259	(1,052,028)
Changes in operating liabilities:
Accounts payable	(2,464,174)	(2,611,778)
Accrued expenses	359,870	(117,773)
Other payables	(422,310)	158,678
Operating lease liabilities	(121,352)	(84,315)
Income tax payable	(307,997)	193,881
Net cash used in operating activities	(11,457,151)	(7,566,853)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(626,680)	(165,522)
Acquisition Deposit	(1,082,905)
Payment for long-term deposits	(62,930)	(76,283)
Net cash used in investing activities	(1,772,515)	(241,805)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividend payment	(566,649)	(566,250)
Repayment from short-term loan	(612,703)	(235)
Net cash used in financing activities	(1,179,352)	(566,485)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	80,006	(595)
NET DECREASE IN CASH	(14,329,012)	(8,375,738)
CASH, AND RESTRICTED CASH, BEGINNING OF THE PERIOD	22,861,711	26,916,709
CASH, AND RESTRICTED CASH, END OF THE PERIOD	8,532,699	18,540,971
CASH AND RESTRICTED CASH, END OF PERIOD	8,532,699	18,540,971
LESS: NON-CURRENT RESTRICTED CASH	876,211	786,298
CASH, END OF PERIOD	7,656,488	17,754,673
Supplemental disclosure information:
Cash paid for interest	28,639
Income tax paid	724,443	148,119
Non-cash financing activities
Right of use assets obtained in exchange for operating lease obligations	$ 353,611	$ 68,932