Income Statement - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Details
Revenues	$ 3,419,294	$ 4,567,309	$ 13,372,391	$ 12,336,433
Revenues - related parties	1,784,135	1,081,379	5,882,694	3,195,115
Total revenues	5,203,429	5,648,688	19,255,085	15,531,548
Cost of revenues	2,733,284	3,754,979	10,472,794	10,795,923
Cost of revenues - related parties	1,955,319	1,124,137	5,671,819	3,022,288
Total cost of revenues	4,688,603	4,879,116	16,144,613	13,818,211
Gross profit	514,826	769,572	3,110,472	1,713,337
Operating expenses:
Selling expenses	360,440	617,802	1,237,645	1,553,249
General and administrative expenses	481,087	643,586	1,165,182	2,051,992
Research and development expenses	633,668	317,876	1,279,620	699,533
Total operating expenses, net	1,475,195	1,579,264	3,682,447	4,304,774
Loss from operations	(960,369)	(809,692)	(571,975)	(2,591,437)
Other (expenses) income
Other income	1,624	4,315	(37,818)	(10,318)
Grant income	17,557	0	31,870	0
Interest income	281	86	549	218
Interest expense - related party	(32,023)	(35,855)	(96,123)	(101,546)
Interest expense	(208,942)	(171,705)	(446,288)	(488,641)
Total other expense	(221,503)	(203,159)	(547,810)	(600,287)
Loss from continuing operations before income taxes	(1,181,872)	(1,012,851)	(1,119,785)	(3,191,724)
Net loss from continuing operations	(1,181,872)	(1,012,851)	(1,119,785)	(3,191,724)
Discontinued operations
Loss from discontinued operations, net of income tax	0	(5,879)	(20,016)	(122,686)
Loss from disposal of discontinued operations	0	0	(960)	0
Loss from sales of subsidiary	0	0	(232,455)	0
Loss from discontinued operations, net of income tax	0	(5,879)	(253,431)	(122,686)
Net loss	(1,181,872)	(1,018,730)	(1,373,216)	(3,314,410)
Comprehensive loss:
Foreign currency translation adjustment	62,438	261,035	224,609	(527,653)
Total comprehensive loss	$ (1,119,434)	$ (757,695)	$ (1,148,607)	$ (3,842,063)
Earnings per common share:
Continuing operations - basic and diluted	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.02)
Discontinued operations - basic and diluted	0.00	(0.00)	(0.00)	(0.00)
Net loss per common share - basic and diluted	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.02)
Weighted average common shares outstanding - basic and diluted	199,632,803	199,632,803	199,632,803	199,632,803