CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)	9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Common Stock [Member]
Stock Issuance costs	$ 193,000	$ 1,427,000
Series E Preferred Stock [Member]
Stock Issuance costs	553,000	0
Stock Options [Member]
Stock Issuance costs	$ 3,000	$ 0