Derivative Financial Instruments and Risk Management (Tables)

9 Months Ended

12 Months Ended

Jan. 31, 2015

Apr. 30, 2014

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		Carrying			Fair Value
As at January 31, 2015		Amount		Fair Value	Levels	Reference
Cash	$	3,703,510	$	3,703,510	1	N/A
Accounts receivable	$	3,168,559	$	3,168,559	2	N/A

		Carrying			Fair Value
As at April 30, 2014		Amount		Fair Value	Levels	Reference
Cash	$	7,172,798	$	7,172,798	1	N/A
Accounts receivable	$	3,401,491	$	3,401,491	2	N/A

Schedule of Warrant Liabilities at Fair Value [Table Text Block]

Forward contracts		January 31,		April 30,
		2015		2014
Opening balance at the beginning of the period/year	$	-	$	9,830
Fair value of forward contract, at issuance		-		-
Change in fair value of forward contracts since issuance		-		180,396
Fair value of forward contracts settled during the period/year		-		(190,226	)
Fair value of forward contracts at end of period/year	$	-	$	-