INTERIM CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
Jan. 31, 2015	Jan. 31, 2014
Cash flows from operating activities:
Net loss for the period	$ (3,027,240)us-gaap_NetIncomeLoss	$ (5,557,327)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	160,959us-gaap_DepreciationAndAmortization	174,032us-gaap_DepreciationAndAmortization
Stock-based compensation	803,463us-gaap_ShareBasedCompensation	848,026us-gaap_ShareBasedCompensation
Fair value adjustment on derivative instruments	0	(12,119)
Foreign exchange gain	(324,576)	915,618
Changes in assets and liabilities:
Accounts receivable	232,931	978,448
Prepaid expenses and deposits	(4,271)	(24,870)
Other assets	(21,035)	(17,884)
Accounts payable and accrued liabilities	(246,083)	(236,484)
Unearned revenue	111,078	146,787
Deferred lease inducements	51,335	(23,992)
Accrued warranty	8,040	(19,190)
Customer deposits	(9,553)	791,000
Net cash used in operating activities	(2,264,952)	(2,037,955)
Cash flows from investing activities:
Purchase of equipment	(195,755)	(151,458)
Deposits	0	0
Net cash used in investing activities	(195,755)	(151,458)
Cash flows from financing activities:
Common stock issued	68	17,184
Common stock repurchased	(310,431)	(180,548)
Net cash used in financing activities	(310,363)	(163,364)
Foreign exchange effect on cash	(698,218)	(733,205)
Net decrease in cash	(3,469,288)	(3,085,982)
Cash, beginning of the period	7,172,798	11,229,595
Cash, end of the period	3,703,510	8,143,613
Supplemental disclosure of cash flow information Cash paid for:
Interest	561us-gaap_InterestPaid	1,585us-gaap_InterestPaid
Income taxes paid	$ 0us-gaap_IncomeTaxesPaid	$ 15,736us-gaap_IncomeTaxesPaid

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