CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (4,203,383)	$ (3,475,124)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Depreciation and amortization expenses	1,121,490	976,095
Loss on disposition of property and equipment	388,228	0
Provisions for obsolete inventories	854,866	664,772
Changes in operating assets and liabilities
Accounts receivable	(865,032)	727,168
Accounts receivable - related party	0	172,894
Inventories	3,387,206	(806,358)
Prepaid expenses and other current assets	(4,593,555)	(13,638)
Accounts payable and accrued expenses	2,152,539	79,530
Taxes payable	444,493	137,303
NET CASH USED IN OPERATING ACTIVITIES	(1,313,148)	(1,537,358)
CASH FLOWS FROM INVESTING ACTIVITIES
Proceed from disposal of equipment	8,060	0
Purchases of property and equipment	(322,015)	(528,708)
Purchases of land use rights	(2,064,156)
NET CASH USED IN INVESTING ACTIVITIES	(2,378,111)	(528,708)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from short term loans	1,094,524	20,555
Repayment of short term loans	0	(911,747)
Advance from related parties	6,162,053	10,413,224
Repayment of related party advances	(4,007,863)	(8,414,263)
NET CASH PROVIDED BY FINANCING ACTIVITIES	3,248,714	1,107,768
EFFECT OF EXCHANGE RATE ON CASH	19,761	45,849
NET DECREASE IN CASH	(422,784)	(912,449)
Cash at the beginning of period	1,565,829	1,137,920
Cash at the end of period	1,143,045	225,471
SUPPLEMENTAL DISCLOSURE OF CASH FLOWS INFORMATION
Cash paid for income taxes	0	0
Cash paid for interest	4,905	17,408
NON-CASH INVESTING AND FINANCING ACTIVITIES
Property and equipment acquired on credit as payable	85,630	232,100
Accrued interest payable to related party	$ 171,944	$ 14,199