Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 813,853	$ 1,549,488
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	412,054	338,652
Stock-based compensation expenses	42,151
Bad debt expense	18,043
Amortization of operating lease right-of-use assets	131,088	110,546
Changes in operating assets:
Accounts receivable	(10,531,884)	(9,383,142)
Inventories	4,556,693	602,719
Prepaid expenses and other current assets	504,484	(285,165)
Advance to suppliers	(1,052,028)	(1,345,913)
Changes in operating liabilities:
Accounts payable	(2,611,778)	(913,522)
Accrued expenses	(117,773)	274,333
Other payables	158,678	367,959
Operating lease liabilities	(84,315)	(50,012)
Income tax payable	193,881	335,000
Net cash used in operating activities	(7,566,853)	(8,399,057)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(165,522)	(1,374,139)
Other long-term assets	(76,283)
Net cash used in investing activities	(241,805)	(1,374,139)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividend distribution	(566,250)	(566,250)
Repayment from short-term loan	(235)	(580,447)
Net cash used in financing activities	(566,485)	(1,146,697)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(595)	4,295
NET DECREASE IN CASH	(8,375,738)	(10,915,598)
CASH, AND RESTRICTED CASH, BEGINNING OF THE PERIOD	26,916,709	27,834,468
CASH, AND RESTRICTED CASH, END OF THE PERIOD	18,540,971	16,918,870
CASH AND RESTRICTED CASH, END OF PERIOD	18,540,971	16,918,870
LESS: NON-CURRENT RESTRICTED CASH	786,298	796,876
CASH, END OF PERIOD	17,754,673	16,121,994
Supplemental disclosure information:
Cash paid for interest		5,186
Income tax paid	148,119
Non-cash financing activities
Right of use assets obtained in exchange for operating lease obligations	$ 68,932	$ 1,292,416