INTERIM CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Cash flows from operating activities:
Net loss for the period	$ (927,931)	$ (1,444,561)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	52,487	120,717
Stock-based compensation	551,190	561,574
Issuance of common stock for services	13,963	0
Foreign exchange gain	(437,795)	(304,990)
Changes in assets and liabilities:
Accounts receivable	219,239	(51,952)
Prepaid expenses and deposits	76,548	35,768
Accounts payable and accrued liabilities	(12,010)	(290,984)
Unearned revenue	319,980	209,729
Deferred lease inducements	(4,987)	(9,008)
Accrued warranty	(1,591)	(6,973)
Customer deposits	941	21,500
Net cash provided by (used in) operating activities	(149,966)	(1,159,180)
Cash flows from investing activities:
Purchase of equipment	(57,517)	(9,177)
Purchase of other assets	(4,023)	0
Net cash used in investing activities	(61,540)	(9,177)
Cash flows from financing activities:
Common stock issued	0	1,510,185
Common stock repurchased	(7,870)	(29,729)
Net cash provided by (used in) financing activities	(7,870)	1,480,456
Foreign exchange effect on cash	(20,597)	(54,348)
Net increase (decrease) in cash	(239,973)	257,751
Cash, beginning of the period	2,159,738	2,852,422
Cash, end of the period	1,919,765	3,110,173
Supplemental disclosure of cash flow information Cash paid for:
Interest	0	2,085
Income taxes paid	$ 0	$ 0