Redeemable Common Stock and Stock Purchase Warrants (Details Textual) (USD $)	1 Months Ended		12 Months Ended
	Jan. 28, 2013	Mar. 24, 2011	Apr. 30, 2014	Apr. 30, 2013
Stock Issued During Period, Shares, Acquisitions	18,600,000	12,533,333
Common Stock Purchase Price	$ 0.50	$ 0.75
Stock Issued During Period, Value, Share-based Compensation, Gross	$ 9,300,000	$ 9,400,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	500,000	500,000
Proceeds from Issuance of Common Stock and Warrants	9,100,000
Percentage of Cash Penalties			1.00%
Purchase Price Limit Percentage			10.00%
Estimated Fair Value of Warrants			2,011,000	1,046,000
Minimum [Member]
Potential Penalties Amount			50,000
Maximum [Member]
Potential Penalties Amount			130,000
January 2013 Private Placement [Member]
Common Stock Purchase Price			$ 0.50
Warrants Issued During Period for Common Stock			1,860,000
Warrants Exercise Price Per Share			$ 0.66
Percentage of Common Stock Purchased			25.00%
Issuance of Additional Common Shares to Investors			1,064,658
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value			8,800,000
Proceeds from Issuance of Common Stock and Warrants			9,300,000
Proceeds from Issuance of Warrants			400,000
Incremental Compensation Cost			200,000
Warrants and Rights Outstanding			800,000
April 2011 Private Placement [Member]
Common Stock Purchase Price			$ 0.75
Warrants Issued During Period for Common Stock			1,266,667
Warrants Exercise Price Per Share			$ 0.90
Percentage of Common Stock Purchased			25.00%
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value			8,200,000
Proceeds from Issuance of Common Stock and Warrants			9,400,000
Proceeds from Issuance of Warrants			900,000
Incremental Compensation Cost			$ 300,000
April 2011 Private Placement [Member] | Minimum [Member]
Warrants Exercise Price Per Share			$ 0.50
April 2011 Private Placement [Member] | Maximum [Member]
Warrants Exercise Price Per Share			$ 0.90