INTERIM CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Cash flows from operating activities:
Net (loss) for the period	$ (993,699)	$ (927,931)
Adjustments to reconcile net loss to net cash used in operating activities:
Deferred lease inducements	(5,057)	(4,987)
Depreciation and amortization	55,869	52,487
Stock-based compensation	406,959	551,190
Issuance of common stock for services	2,776	13,963
Foreign exchange loss (gain)	383,154	(437,795)
Changes in assets and liabilities:
Accounts receivable	(1,685,153)	219,239
Prepaid expenses and deposits	29,060	76,548
Accounts payable and accrued liabilities	38,392	(12,010)
Unearned revenue	237,611	319,980
Accrued warranty	6,295	(1,591)
Customer deposits	(3,831)	941
Net cash used in operating activities	(1,527,624)	(149,966)
Cash flows from investing activities:
Purchase of equipment	(51,818)	(57,517)
Purchase of other assets	(10,585)	(4,023)
Net cash used in investing activities	(62,403)	(61,540)
Cash flows from financing activities:
Common stock issued	1,195,776	0
Common stock repurchased	(33,220)	(7,870)
Net cash provided by (used in) financing activities	1,162,556	(7,870)
Foreign exchange effect on cash	38,584	(20,597)
Net decrease in cash	(388,887)	(239,973)
Cash, beginning of the period	2,071,019	2,159,738
Cash, end of the period	1,682,132	1,919,765
Supplemental disclosure of cash flow information Cash paid for:
Interest	162	0
Income taxes paid	$ 0	$ 0