INTERIM CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS EQUITY (Unaudited) - USD ($)	Common Shares [Member]	Treasury Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Beginning Balance at Apr. 30, 2019	$ 5,950	$ 0	$ 75,667,533	$ (68,581,091)	$ (3,866,495)	$ 3,225,897
Beginning Balance (Shares) at Apr. 30, 2019	5,950,246
Stock-based compensation	$ 0	0	68,341	0	0	68,341
Employee share purchase program	$ 3	0	5,260	0	0	5,263
Employee share purchase program (Shares)	3,134
Net income (loss) for the period	$ 0	0	0	(929,723)	0	(929,723)
Foreign currency translation adjustment	0	0	0	0	302,543	302,543
Ending Balance at Jul. 31, 2019	$ 5,953	0	75,741,134	(69,510,814)	(3,563,952)	2,672,321
Ending Balance (Shares) at Jul. 31, 2019	5,953,380
Beginning Balance at Apr. 30, 2020	$ 6,104	0	76,066,930	(69,677,656)	(4,351,061)	2,044,317
Beginning Balance (Shares) at Apr. 30, 2020	6,103,612
Stock-based compensation	$ 0	0	70,183	0	0	70,183
Private placement	$ 285	$ 0	999,721	0	0	1,000,006
Private placement (Shares)	284,902	0
Private placement costs	$ 0	$ 0	(6,692)	0	0	(6,692)
Employee share purchase program	$ 1	0	4,607	0	0	4,608
Employee share purchase program (Shares)	1,286
Exercise of stock options	$ 21	0	(1,481)	0	0	$ (1,460)
Exercise of stock options (Shares)	21,263					44,588
Net income (loss) for the period	$ 0	0	0	24,614	0	$ 24,614
Foreign currency translation adjustment	0	0	0	0	511,513	511,513
Ending Balance at Jul. 31, 2020	$ 6,411	$ 0	$ 77,133,268	$ (69,653,042)	$ (3,839,548)	$ 3,647,089
Ending Balance (Shares) at Jul. 31, 2020	6,411,063